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   1  <?php
   2  /**
   3   * WordPress API for media display.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Scale down the default size of an image.
  10   *
  11   * This is so that the image is a better fit for the editor and theme.
  12   *
  13   * The $size parameter accepts either an array or a string. The supported string
  14   * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at
  15   * 128 width and 96 height in pixels. Also supported for the string value is
  16   * 'medium' and 'full'. The 'full' isn't actually supported, but any value other
  17   * than the supported will result in the content_width size or 500 if that is
  18   * not set.
  19   *
  20   * Finally, there is a filter named, 'editor_max_image_size' that will be called
  21   * on the calculated array for width and height, respectively. The second
  22   * parameter will be the value that was in the $size parameter. The returned
  23   * type for the hook is an array with the width as the first element and the
  24   * height as the second element.
  25   *
  26   * @since 2.5.0
  27   * @uses wp_constrain_dimensions() This function passes the widths and the heights.
  28   *
  29   * @param int $width Width of the image
  30   * @param int $height Height of the image
  31   * @param string|array $size Size of what the result image should be.
  32   * @return array Width and height of what the result image should resize to.
  33   */
  34  function image_constrain_size_for_editor($width, $height, $size = 'medium') {
  35      global $content_width, $_wp_additional_image_sizes;
  36  
  37      if ( is_array($size) ) {
  38          $max_width = $size[0];
  39          $max_height = $size[1];
  40      }
  41      elseif ( $size == 'thumb' || $size == 'thumbnail' ) {
  42          $max_width = intval(get_option('thumbnail_size_w'));
  43          $max_height = intval(get_option('thumbnail_size_h'));
  44          // last chance thumbnail size defaults
  45          if ( !$max_width && !$max_height ) {
  46              $max_width = 128;
  47              $max_height = 96;
  48          }
  49      }
  50      elseif ( $size == 'medium' ) {
  51          $max_width = intval(get_option('medium_size_w'));
  52          $max_height = intval(get_option('medium_size_h'));
  53          // if no width is set, default to the theme content width if available
  54      }
  55      elseif ( $size == 'large' ) {
  56          // we're inserting a large size image into the editor.  if it's a really
  57          // big image we'll scale it down to fit reasonably within the editor
  58          // itself, and within the theme's content width if it's known.  the user
  59          // can resize it in the editor if they wish.
  60          $max_width = intval(get_option('large_size_w'));
  61          $max_height = intval(get_option('large_size_h'));
  62          if ( intval($content_width) > 0 )
  63              $max_width = min( intval($content_width), $max_width );
  64      } elseif ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ) ) ) {
  65          $max_width = intval( $_wp_additional_image_sizes[$size]['width'] );
  66          $max_height = intval( $_wp_additional_image_sizes[$size]['height'] );
  67          if ( intval($content_width) > 0 )
  68              $max_width = min( intval($content_width), $max_width );
  69      }
  70      // $size == 'full' has no constraint
  71      else {
  72          $max_width = $width;
  73          $max_height = $height;
  74      }
  75  
  76      list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size );
  77  
  78      return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
  79  }
  80  
  81  /**
  82   * Retrieve width and height attributes using given width and height values.
  83   *
  84   * Both attributes are required in the sense that both parameters must have a
  85   * value, but are optional in that if you set them to false or null, then they
  86   * will not be added to the returned string.
  87   *
  88   * You can set the value using a string, but it will only take numeric values.
  89   * If you wish to put 'px' after the numbers, then it will be stripped out of
  90   * the return.
  91   *
  92   * @since 2.5.0
  93   *
  94   * @param int|string $width Optional. Width attribute value.
  95   * @param int|string $height Optional. Height attribute value.
  96   * @return string HTML attributes for width and, or height.
  97   */
  98  function image_hwstring($width, $height) {
  99      $out = '';
 100      if ($width)
 101          $out .= 'width="'.intval($width).'" ';
 102      if ($height)
 103          $out .= 'height="'.intval($height).'" ';
 104      return $out;
 105  }
 106  
 107  /**
 108   * Scale an image to fit a particular size (such as 'thumb' or 'medium').
 109   *
 110   * Array with image url, width, height, and whether is intermediate size, in
 111   * that order is returned on success is returned. $is_intermediate is true if
 112   * $url is a resized image, false if it is the original.
 113   *
 114   * The URL might be the original image, or it might be a resized version. This
 115   * function won't create a new resized copy, it will just return an already
 116   * resized one if it exists.
 117   *
 118   * A plugin may use the 'image_downsize' filter to hook into and offer image
 119   * resizing services for images. The hook must return an array with the same
 120   * elements that are returned in the function. The first element being the URL
 121   * to the new image that was resized.
 122   *
 123   * @since 2.5.0
 124   * @uses apply_filters() Calls 'image_downsize' on $id and $size to provide
 125   *        resize services.
 126   *
 127   * @param int $id Attachment ID for image.
 128   * @param string $size Optional, default is 'medium'. Size of image, can be 'thumbnail'.
 129   * @return bool|array False on failure, array on success.
 130   */
 131  function image_downsize($id, $size = 'medium') {
 132  
 133      if ( !wp_attachment_is_image($id) )
 134          return false;
 135  
 136      $img_url = wp_get_attachment_url($id);
 137      $meta = wp_get_attachment_metadata($id);
 138      $width = $height = 0;
 139      $is_intermediate = false;
 140  
 141      // plugins can use this to provide resize services
 142      if ( $out = apply_filters('image_downsize', false, $id, $size) )
 143          return $out;
 144  
 145      // try for a new style intermediate size
 146      if ( $intermediate = image_get_intermediate_size($id, $size) ) {
 147          $img_url = str_replace(basename($img_url), $intermediate['file'], $img_url);
 148          $width = $intermediate['width'];
 149          $height = $intermediate['height'];
 150          $is_intermediate = true;
 151      }
 152      elseif ( $size == 'thumbnail' ) {
 153          // fall back to the old thumbnail
 154          if ( ($thumb_file = wp_get_attachment_thumb_file($id)) && $info = getimagesize($thumb_file) ) {
 155              $img_url = str_replace(basename($img_url), basename($thumb_file), $img_url);
 156              $width = $info[0];
 157              $height = $info[1];
 158              $is_intermediate = true;
 159          }
 160      }
 161      if ( !$width && !$height && isset($meta['width'], $meta['height']) ) {
 162          // any other type: use the real image
 163          $width = $meta['width'];
 164          $height = $meta['height'];
 165      }
 166  
 167      if ( $img_url) {
 168          // we have the actual image size, but might need to further constrain it if content_width is narrower
 169          list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
 170  
 171          return array( $img_url, $width, $height, $is_intermediate );
 172      }
 173      return false;
 174  
 175  }
 176  
 177  /**
 178   * Registers a new image size
 179   */
 180  function add_image_size( $name, $width = 0, $height = 0, $crop = FALSE ) {
 181      global $_wp_additional_image_sizes;
 182      $_wp_additional_image_sizes[$name] = array( 'width' => absint( $width ), 'height' => absint( $height ), 'crop' => !!$crop );
 183  }
 184  
 185  /**
 186   * Registers an image size for the post thumbnail
 187   */
 188  function set_post_thumbnail_size( $width = 0, $height = 0, $crop = FALSE ) {
 189      add_image_size( 'post-thumbnail', $width, $height, $crop );
 190  }
 191  
 192  /**
 193   * An <img src /> tag for an image attachment, scaling it down if requested.
 194   *
 195   * The filter 'get_image_tag_class' allows for changing the class name for the
 196   * image without having to use regular expressions on the HTML content. The
 197   * parameters are: what WordPress will use for the class, the Attachment ID,
 198   * image align value, and the size the image should be.
 199   *
 200   * The second filter 'get_image_tag' has the HTML content, which can then be
 201   * further manipulated by a plugin to change all attribute values and even HTML
 202   * content.
 203   *
 204   * @since 2.5.0
 205   *
 206   * @uses apply_filters() The 'get_image_tag_class' filter is the IMG element
 207   *        class attribute.
 208   * @uses apply_filters() The 'get_image_tag' filter is the full IMG element with
 209   *        all attributes.
 210   *
 211   * @param int $id Attachment ID.
 212   * @param string $alt Image Description for the alt attribute.
 213   * @param string $title Image Description for the title attribute.
 214   * @param string $align Part of the class name for aligning the image.
 215   * @param string $size Optional. Default is 'medium'.
 216   * @return string HTML IMG element for given image attachment
 217   */
 218  function get_image_tag($id, $alt, $title, $align, $size='medium') {
 219  
 220      list( $img_src, $width, $height ) = image_downsize($id, $size);
 221      $hwstring = image_hwstring($width, $height);
 222  
 223      $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;
 224      $class = apply_filters('get_image_tag_class', $class, $id, $align, $size);
 225  
 226      $html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" title="' . esc_attr($title).'" '.$hwstring.'class="'.$class.'" />';
 227  
 228      $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
 229  
 230      return $html;
 231  }
 232  
 233  /**
 234   * Calculates the new dimentions for a downsampled image.
 235   *
 236   * Same as {@link wp_shrink_dimensions()}, except the max parameters are
 237   * optional. If either width or height are empty, no constraint is applied on
 238   * that dimension.
 239   *
 240   * @since 2.5.0
 241   *
 242   * @param int $current_width Current width of the image.
 243   * @param int $current_height Current height of the image.
 244   * @param int $max_width Optional. Maximum wanted width.
 245   * @param int $max_height Optional. Maximum wanted height.
 246   * @return array First item is the width, the second item is the height.
 247   */
 248  function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
 249      if ( !$max_width and !$max_height )
 250          return array( $current_width, $current_height );
 251  
 252      $width_ratio = $height_ratio = 1.0;
 253  
 254      if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width )
 255          $width_ratio = $max_width / $current_width;
 256  
 257      if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height )
 258          $height_ratio = $max_height / $current_height;
 259  
 260      // the smaller ratio is the one we need to fit it to the constraining box
 261      $ratio = min( $width_ratio, $height_ratio );
 262  
 263      return array( intval($current_width * $ratio), intval($current_height * $ratio) );
 264  }
 265  
 266  /**
 267   * Retrieve calculated resized dimensions for use in imagecopyresampled().
 268   *
 269   * Calculate dimensions and coordinates for a resized image that fits within a
 270   * specified width and height. If $crop is true, the largest matching central
 271   * portion of the image will be cropped out and resized to the required size.
 272   *
 273   * @since 2.5.0
 274   *
 275   * @param int $orig_w Original width.
 276   * @param int $orig_h Original height.
 277   * @param int $dest_w New width.
 278   * @param int $dest_h New height.
 279   * @param bool $crop Optional, default is false. Whether to crop image or resize.
 280   * @return bool|array False, on failure. Returned array matches parameters for imagecopyresampled() PHP function.
 281   */
 282  function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop = false) {
 283  
 284      if ($orig_w <= 0 || $orig_h <= 0)
 285          return false;
 286      // at least one of dest_w or dest_h must be specific
 287      if ($dest_w <= 0 && $dest_h <= 0)
 288          return false;
 289  
 290      if ( $crop ) {
 291          // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
 292          $aspect_ratio = $orig_w / $orig_h;
 293          $new_w = min($dest_w, $orig_w);
 294          $new_h = min($dest_h, $orig_h);
 295  
 296          if ( !$new_w ) {
 297              $new_w = intval($new_h * $aspect_ratio);
 298          }
 299  
 300          if ( !$new_h ) {
 301              $new_h = intval($new_w / $aspect_ratio);
 302          }
 303  
 304          $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
 305  
 306          $crop_w = round($new_w / $size_ratio);
 307          $crop_h = round($new_h / $size_ratio);
 308  
 309          $s_x = floor( ($orig_w - $crop_w) / 2 );
 310          $s_y = floor( ($orig_h - $crop_h) / 2 );
 311      } else {
 312          // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
 313          $crop_w = $orig_w;
 314          $crop_h = $orig_h;
 315  
 316          $s_x = 0;
 317          $s_y = 0;
 318  
 319          list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
 320      }
 321  
 322      // if the resulting image would be the same size or larger we don't want to resize it
 323      if ( $new_w >= $orig_w && $new_h >= $orig_h )
 324          return false;
 325  
 326      // the return array matches the parameters to imagecopyresampled()
 327      // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
 328      return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
 329  
 330  }
 331  
 332  /**
 333   * Scale down an image to fit a particular size and save a new copy of the image.
 334   *
 335   * The PNG transparency will be preserved using the function, as well as the
 336   * image type. If the file going in is PNG, then the resized image is going to
 337   * be PNG. The only supported image types are PNG, GIF, and JPEG.
 338   *
 339   * Some functionality requires API to exist, so some PHP version may lose out
 340   * support. This is not the fault of WordPress (where functionality is
 341   * downgraded, not actual defects), but of your PHP version.
 342   *
 343   * @since 2.5.0
 344   *
 345   * @param string $file Image file path.
 346   * @param int $max_w Maximum width to resize to.
 347   * @param int $max_h Maximum height to resize to.
 348   * @param bool $crop Optional. Whether to crop image or resize.
 349   * @param string $suffix Optional. File Suffix.
 350   * @param string $dest_path Optional. New image file path.
 351   * @param int $jpeg_quality Optional, default is 90. Image quality percentage.
 352   * @return mixed WP_Error on failure. String with new destination path. Array of dimensions from {@link image_resize_dimensions()}
 353   */
 354  function image_resize( $file, $max_w, $max_h, $crop = false, $suffix = null, $dest_path = null, $jpeg_quality = 90 ) {
 355  
 356      $image = wp_load_image( $file );
 357      if ( !is_resource( $image ) )
 358          return new WP_Error('error_loading_image', $image);
 359  
 360      $size = @getimagesize( $file );
 361      if ( !$size )
 362          return new WP_Error('invalid_image', __('Could not read image size'), $file);
 363      list($orig_w, $orig_h, $orig_type) = $size;
 364  
 365      $dims = image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);
 366      if ( !$dims )
 367          return $dims;
 368      list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims;
 369  
 370      $newimage = wp_imagecreatetruecolor( $dst_w, $dst_h );
 371  
 372      imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
 373  
 374      // convert from full colors to index colors, like original PNG.
 375      if ( IMAGETYPE_PNG == $orig_type && !imageistruecolor( $image ) )
 376          imagetruecolortopalette( $newimage, false, imagecolorstotal( $image ) );
 377  
 378      // we don't need the original in memory anymore
 379      imagedestroy( $image );
 380  
 381      // $suffix will be appended to the destination filename, just before the extension
 382      if ( !$suffix )
 383          $suffix = "{$dst_w}x{$dst_h}";
 384  
 385      $info = pathinfo($file);
 386      $dir = $info['dirname'];
 387      $ext = $info['extension'];
 388      $name = basename($file, ".{$ext}");
 389      if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )
 390          $dir = $_dest_path;
 391      $destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
 392  
 393      if ( IMAGETYPE_GIF == $orig_type ) {
 394          if ( !imagegif( $newimage, $destfilename ) )
 395              return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
 396      } elseif ( IMAGETYPE_PNG == $orig_type ) {
 397          if ( !imagepng( $newimage, $destfilename ) )
 398              return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
 399      } else {
 400          // all other formats are converted to jpg
 401          $destfilename = "{$dir}/{$name}-{$suffix}.jpg";
 402          if ( !imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) )
 403              return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
 404      }
 405  
 406      imagedestroy( $newimage );
 407  
 408      // Set correct file permissions
 409      $stat = stat( dirname( $destfilename ));
 410      $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
 411      @ chmod( $destfilename, $perms );
 412  
 413      return $destfilename;
 414  }
 415  
 416  /**
 417   * Resize an image to make a thumbnail or intermediate size.
 418   *
 419   * The returned array has the file size, the image width, and image height. The
 420   * filter 'image_make_intermediate_size' can be used to hook in and change the
 421   * values of the returned array. The only parameter is the resized file path.
 422   *
 423   * @since 2.5.0
 424   *
 425   * @param string $file File path.
 426   * @param int $width Image width.
 427   * @param int $height Image height.
 428   * @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize.
 429   * @return bool|array False, if no image was created. Metadata array on success.
 430   */
 431  function image_make_intermediate_size($file, $width, $height, $crop=false) {
 432      if ( $width || $height ) {
 433          $resized_file = image_resize($file, $width, $height, $crop);
 434          if ( !is_wp_error($resized_file) && $resized_file && $info = getimagesize($resized_file) ) {
 435              $resized_file = apply_filters('image_make_intermediate_size', $resized_file);
 436              return array(
 437                  'file' => basename( $resized_file ),
 438                  'width' => $info[0],
 439                  'height' => $info[1],
 440              );
 441          }
 442      }
 443      return false;
 444  }
 445  
 446  /**
 447   * Retrieve the image's intermediate size (resized) path, width, and height.
 448   *
 449   * The $size parameter can be an array with the width and height respectively.
 450   * If the size matches the 'sizes' metadata array for width and height, then it
 451   * will be used. If there is no direct match, then the nearest image size larger
 452   * than the specified size will be used. If nothing is found, then the function
 453   * will break out and return false.
 454   *
 455   * The metadata 'sizes' is used for compatible sizes that can be used for the
 456   * parameter $size value.
 457   *
 458   * The url path will be given, when the $size parameter is a string.
 459   *
 460   * @since 2.5.0
 461   *
 462   * @param int $post_id Attachment ID for image.
 463   * @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string.
 464   * @return bool|array False on failure or array of file path, width, and height on success.
 465   */
 466  function image_get_intermediate_size($post_id, $size='thumbnail') {
 467      if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) )
 468          return false;
 469  
 470      // get the best one for a specified set of dimensions
 471      if ( is_array($size) && !empty($imagedata['sizes']) ) {
 472          foreach ( $imagedata['sizes'] as $_size => $data ) {
 473              // already cropped to width or height; so use this size
 474              if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) {
 475                  $file = $data['file'];
 476                  list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
 477                  return compact( 'file', 'width', 'height' );
 478              }
 479              // add to lookup table: area => size
 480              $areas[$data['width'] * $data['height']] = $_size;
 481          }
 482          if ( !$size || !empty($areas) ) {
 483              // find for the smallest image not smaller than the desired size
 484              ksort($areas);
 485              foreach ( $areas as $_size ) {
 486                  $data = $imagedata['sizes'][$_size];
 487                  if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) {
 488                      $file = $data['file'];
 489                      list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
 490                      return compact( 'file', 'width', 'height' );
 491                  }
 492              }
 493          }
 494      }
 495  
 496      if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )
 497          return false;
 498  
 499      $data = $imagedata['sizes'][$size];
 500      // include the full filesystem path of the intermediate file
 501      if ( empty($data['path']) && !empty($data['file']) ) {
 502          $file_url = wp_get_attachment_url($post_id);
 503          $data['path'] = path_join( dirname($imagedata['file']), $data['file'] );
 504          $data['url'] = path_join( dirname($file_url), $data['file'] );
 505      }
 506      return $data;
 507  }
 508  
 509  /**
 510   * Retrieve an image to represent an attachment.
 511   *
 512   * A mime icon for files, thumbnail or intermediate size for images.
 513   *
 514   * @since 2.5.0
 515   *
 516   * @param int $attachment_id Image attachment ID.
 517   * @param string $size Optional, default is 'thumbnail'.
 518   * @param bool $icon Optional, default is false. Whether it is an icon.
 519   * @return bool|array Returns an array (url, width, height), or false, if no image is available.
 520   */
 521  function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {
 522  
 523      // get a thumbnail or intermediate image if there is one
 524      if ( $image = image_downsize($attachment_id, $size) )
 525          return $image;
 526  
 527      $src = false;
 528  
 529      if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
 530          $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
 531          $src_file = $icon_dir . '/' . basename($src);
 532          @list($width, $height) = getimagesize($src_file);
 533      }
 534      if ( $src && $width && $height )
 535          return array( $src, $width, $height );
 536      return false;
 537  }
 538  
 539  /**
 540   * Get an HTML img element representing an image attachment
 541   *
 542   * @uses apply_filters() Calls 'wp_get_attachment_image_attributes' hook on attributes array
 543   * @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions
 544   * @since 2.5.0
 545   *
 546   * @param int $attachment_id Image attachment ID.
 547   * @param string $size Optional, default is 'thumbnail'.
 548   * @param bool $icon Optional, default is false. Whether it is an icon.
 549   * @return string HTML img element or empty string on failure.
 550   */
 551  function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false, $attr = '') {
 552  
 553      $html = '';
 554      $image = wp_get_attachment_image_src($attachment_id, $size, $icon);
 555      if ( $image ) {
 556          list($src, $width, $height) = $image;
 557          $hwstring = image_hwstring($width, $height);
 558          if ( is_array($size) )
 559              $size = join('x', $size);
 560          $attachment =& get_post($attachment_id);
 561          $default_attr = array(
 562              'src'    => $src,
 563              'class'    => "attachment-$size",
 564              'alt'    => trim(strip_tags( $attachment->post_excerpt )),
 565              'title'    => trim(strip_tags( $attachment->post_title )),
 566          );
 567          $attr = wp_parse_args($attr, $default_attr);
 568          $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );
 569          $attr = array_map( 'esc_attr', $attr );
 570          $html = rtrim("<img $hwstring");
 571          foreach ( $attr as $name => $value ) {
 572              $html .= " $name=" . '"' . $value . '"';
 573          }
 574          $html .= ' />';
 575      }
 576  
 577      return $html;
 578  }
 579  
 580  /**
 581   * Adds a 'wp-post-image' class to post thumbnail thumbnails
 582   * Uses the begin_fetch_post_thumbnail_html and end_fetch_post_thumbnail_html action hooks to
 583   * dynamically add/remove itself so as to only filter post thumbnail thumbnails
 584   *
 585   * @author Mark Jaquith
 586   * @since 2.9.0
 587   * @param array $attr Attributes including src, class, alt, title
 588   * @return array
 589   */
 590  function _wp_post_thumbnail_class_filter( $attr ) {
 591      $attr['class'] .= ' wp-post-image';
 592      return $attr;
 593  }
 594  
 595  /**
 596   * Adds _wp_post_thumbnail_class_filter to the wp_get_attachment_image_attributes filter
 597   *
 598   * @author Mark Jaquith
 599   * @since 2.9.0
 600   */
 601  function _wp_post_thumbnail_class_filter_add( $attr ) {
 602      add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
 603  }
 604  
 605  /**
 606   * Removes _wp_post_thumbnail_class_filter from the wp_get_attachment_image_attributes filter
 607   *
 608   * @author Mark Jaquith
 609   * @since 2.9.0
 610   */
 611  function _wp_post_thumbnail_class_filter_remove( $attr ) {
 612      remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
 613  }
 614  
 615  add_shortcode('wp_caption', 'img_caption_shortcode');
 616  add_shortcode('caption', 'img_caption_shortcode');
 617  
 618  /**
 619   * The Caption shortcode.
 620   *
 621   * Allows a plugin to replace the content that would otherwise be returned. The
 622   * filter is 'img_caption_shortcode' and passes an empty string, the attr
 623   * parameter and the content parameter values.
 624   *
 625   * The supported attributes for the shortcode are 'id', 'align', 'width', and
 626   * 'caption'.
 627   *
 628   * @since 2.6.0
 629   *
 630   * @param array $attr Attributes attributed to the shortcode.
 631   * @param string $content Optional. Shortcode content.
 632   * @return string
 633   */
 634  function img_caption_shortcode($attr, $content = null) {
 635  
 636      // Allow plugins/themes to override the default caption template.
 637      $output = apply_filters('img_caption_shortcode', '', $attr, $content);
 638      if ( $output != '' )
 639          return $output;
 640  
 641      extract(shortcode_atts(array(
 642          'id'    => '',
 643          'align'    => 'alignnone',
 644          'width'    => '',
 645          'caption' => ''
 646      ), $attr));
 647  
 648      if ( 1 > (int) $width || empty($caption) )
 649          return $content;
 650  
 651      if ( $id ) $id = 'id="' . esc_attr($id) . '" ';
 652  
 653      return '<div ' . $id . 'class="wp-caption ' . esc_attr($align) . '" style="width: ' . (10 + (int) $width) . 'px">'
 654      . do_shortcode( $content ) . '<p class="wp-caption-text">' . $caption . '</p></div>';
 655  }
 656  
 657  add_shortcode('gallery', 'gallery_shortcode');
 658  
 659  /**
 660   * The Gallery shortcode.
 661   *
 662   * This implements the functionality of the Gallery Shortcode for displaying
 663   * WordPress images on a post.
 664   *
 665   * @since 2.5.0
 666   *
 667   * @param array $attr Attributes attributed to the shortcode.
 668   * @return string HTML content to display gallery.
 669   */
 670  function gallery_shortcode($attr) {
 671      global $post, $wp_locale;
 672  
 673      static $instance = 0;
 674      $instance++;
 675  
 676      // Allow plugins/themes to override the default gallery template.
 677      $output = apply_filters('post_gallery', '', $attr);
 678      if ( $output != '' )
 679          return $output;
 680  
 681      // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
 682      if ( isset( $attr['orderby'] ) ) {
 683          $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
 684          if ( !$attr['orderby'] )
 685              unset( $attr['orderby'] );
 686      }
 687  
 688      extract(shortcode_atts(array(
 689          'order'      => 'ASC',
 690          'orderby'    => 'menu_order ID',
 691          'id'         => $post->ID,
 692          'itemtag'    => 'dl',
 693          'icontag'    => 'dt',
 694          'captiontag' => 'dd',
 695          'columns'    => 3,
 696          'size'       => 'thumbnail',
 697          'include'    => '',
 698          'exclude'    => ''
 699      ), $attr));
 700  
 701      $id = intval($id);
 702      if ( 'RAND' == $order )
 703          $orderby = 'none';
 704  
 705      if ( !empty($include) ) {
 706          $include = preg_replace( '/[^0-9,]+/', '', $include );
 707          $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
 708  
 709          $attachments = array();
 710          foreach ( $_attachments as $key => $val ) {
 711              $attachments[$val->ID] = $_attachments[$key];
 712          }
 713      } elseif ( !empty($exclude) ) {
 714          $exclude = preg_replace( '/[^0-9,]+/', '', $exclude );
 715          $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
 716      } else {
 717          $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
 718      }
 719  
 720      if ( empty($attachments) )
 721          return '';
 722  
 723      if ( is_feed() ) {
 724          $output = "\n";
 725          foreach ( $attachments as $att_id => $attachment )
 726              $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
 727          return $output;
 728      }
 729  
 730      $itemtag = tag_escape($itemtag);
 731      $captiontag = tag_escape($captiontag);
 732      $columns = intval($columns);
 733      $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
 734      $float = $wp_locale->text_direction == 'rtl' ? 'right' : 'left'; 
 735      
 736      $selector = "gallery-{$instance}";
 737  
 738      $output = apply_filters('gallery_style', "
 739          <style type='text/css'>
 740              #{$selector} {
 741                  margin: auto;
 742              }
 743              #{$selector} .gallery-item {
 744                  float: {$float};
 745                  margin-top: 10px;
 746                  text-align: center;
 747                  width: {$itemwidth}%;            }
 748              #{$selector} img {
 749                  border: 2px solid #cfcfcf;
 750              }
 751              #{$selector} .gallery-caption {
 752                  margin-left: 0;
 753              }
 754          </style>
 755          <!-- see gallery_shortcode() in wp-includes/media.php -->
 756          <div id='$selector' class='gallery galleryid-{$id}'>");
 757  
 758      $i = 0;
 759      foreach ( $attachments as $id => $attachment ) {
 760          $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);
 761  
 762          $output .= "<{$itemtag} class='gallery-item'>";
 763          $output .= "
 764              <{$icontag} class='gallery-icon'>
 765                  $link
 766              </{$icontag}>";
 767          if ( $captiontag && trim($attachment->post_excerpt) ) {
 768              $output .= "
 769                  <{$captiontag} class='gallery-caption'>
 770                  " . wptexturize($attachment->post_excerpt) . "
 771                  </{$captiontag}>";
 772          }
 773          $output .= "</{$itemtag}>";
 774          if ( $columns > 0 && ++$i % $columns == 0 )
 775              $output .= '<br style="clear: both" />';
 776      }
 777  
 778      $output .= "
 779              <br style='clear: both;' />
 780          </div>\n";
 781  
 782      return $output;
 783  }
 784  
 785  /**
 786   * Display previous image link that has the same post parent.
 787   *
 788   * @since 2.5.0
 789   * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
 790   * @param string $text Optional, default is false. If included, link will reflect $text variable.
 791   * @return string HTML content.
 792   */
 793  function previous_image_link($size = 'thumbnail', $text = false) {
 794      adjacent_image_link(true, $size, $text);
 795  }
 796  
 797  /**
 798   * Display next image link that has the same post parent.
 799   *
 800   * @since 2.5.0
 801   * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
 802   * @param string $text Optional, default is false. If included, link will reflect $text variable.
 803   * @return string HTML content.
 804   */
 805  function next_image_link($size = 'thumbnail', $text = false) {
 806      adjacent_image_link(false, $size, $text);
 807  }
 808  
 809  /**
 810   * Display next or previous image link that has the same post parent.
 811   *
 812   * Retrieves the current attachment object from the $post global.
 813   *
 814   * @since 2.5.0
 815   *
 816   * @param bool $prev Optional. Default is true to display previous link, true for next.
 817   */
 818  function adjacent_image_link($prev = true, $size = 'thumbnail', $text = false) {
 819      global $post;
 820      $post = get_post($post);
 821      $attachments = array_values(get_children( array('post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID') ));
 822  
 823      foreach ( $attachments as $k => $attachment )
 824          if ( $attachment->ID == $post->ID )
 825              break;
 826  
 827      $k = $prev ? $k - 1 : $k + 1;
 828  
 829      if ( isset($attachments[$k]) )
 830          echo wp_get_attachment_link($attachments[$k]->ID, $size, true, false, $text);
 831  }
 832  
 833  /**
 834   * Retrieve taxonomies attached to the attachment.
 835   *
 836   * @since 2.5.0
 837   *
 838   * @param int|array|object $attachment Attachment ID, Attachment data array, or Attachment data object.
 839   * @return array Empty array on failure. List of taxonomies on success.
 840   */
 841  function get_attachment_taxonomies($attachment) {
 842      if ( is_int( $attachment ) )
 843          $attachment = get_post($attachment);
 844      else if ( is_array($attachment) )
 845          $attachment = (object) $attachment;
 846  
 847      if ( ! is_object($attachment) )
 848          return array();
 849  
 850      $filename = basename($attachment->guid);
 851  
 852      $objects = array('attachment');
 853  
 854      if ( false !== strpos($filename, '.') )
 855          $objects[] = 'attachment:' . substr($filename, strrpos($filename, '.') + 1);
 856      if ( !empty($attachment->post_mime_type) ) {
 857          $objects[] = 'attachment:' . $attachment->post_mime_type;
 858          if ( false !== strpos($attachment->post_mime_type, '/') )
 859              foreach ( explode('/', $attachment->post_mime_type) as $token )
 860                  if ( !empty($token) )
 861                      $objects[] = "attachment:$token";
 862      }
 863  
 864      $taxonomies = array();
 865      foreach ( $objects as $object )
 866          if ( $taxes = get_object_taxonomies($object) )
 867              $taxonomies = array_merge($taxonomies, $taxes);
 868  
 869      return array_unique($taxonomies);
 870  }
 871  
 872  /**
 873   * Check if the installed version of GD supports particular image type
 874   *
 875   * @since 2.9.0
 876   *
 877   * @param $mime_type string
 878   * @return bool
 879   */
 880  function gd_edit_image_support($mime_type) {
 881      if ( function_exists('imagetypes') ) {
 882          switch( $mime_type ) {
 883              case 'image/jpeg':
 884                  return (imagetypes() & IMG_JPG) != 0;
 885              case 'image/png':
 886                  return (imagetypes() & IMG_PNG) != 0;
 887              case 'image/gif':
 888                  return (imagetypes() & IMG_GIF) != 0;
 889          }
 890      } else {
 891          switch( $mime_type ) {
 892              case 'image/jpeg':
 893                  return function_exists('imagecreatefromjpeg');
 894              case 'image/png':
 895                  return function_exists('imagecreatefrompng');
 896              case 'image/gif':
 897                  return function_exists('imagecreatefromgif');
 898          }
 899      }
 900      return false;
 901  }
 902  
 903  /**
 904   * Create new GD image resource with transparency support
 905   *
 906   * @since 2.9.0
 907   *
 908   * @param $width
 909   * @param $height
 910   * @return image resource
 911   */
 912  function wp_imagecreatetruecolor($width, $height) {
 913      $img = imagecreatetruecolor($width, $height);
 914      if ( is_resource($img) && function_exists('imagealphablending') && function_exists('imagesavealpha') ) {
 915          imagealphablending($img, false);
 916          imagesavealpha($img, true);
 917      }
 918      return $img;
 919  }
 920  
 921  /**
 922   * API for easily embedding rich media such as videos and images into content.
 923   *
 924   * @package WordPress
 925   * @subpackage Embed
 926   * @since 2.9.0
 927   */
 928  class WP_Embed {
 929      var $handlers = array();
 930      var $post_ID;
 931      var $usecache = true;
 932      var $linkifunknown = true;
 933  
 934      /**
 935       * PHP4 constructor
 936       */
 937  	function WP_Embed() {
 938          return $this->__construct();
 939      }
 940  
 941      /**
 942       * PHP5 constructor
 943       */
 944  	function __construct() {
 945          // Hack to get the [embed] shortcode to run before wpautop()
 946          add_filter( 'the_content', array(&$this, 'run_shortcode'), 8 );
 947  
 948          // Attempts to embed all URLs in a post
 949          if ( get_option('embed_autourls') )
 950              add_filter( 'the_content', array(&$this, 'autoembed'), 8 );
 951  
 952          // After a post is saved, invalidate the oEmbed cache
 953          add_action( 'save_post', array(&$this, 'delete_oembed_caches') );
 954  
 955          // After a post is saved, cache oEmbed items via AJAX
 956          add_action( 'edit_form_advanced', array(&$this, 'maybe_run_ajax_cache') );
 957      }
 958  
 959      /**
 960       * Process the [embed] shortcode.
 961       *
 962       * Since the [embed] shortcode needs to be run earlier than other shortcodes,
 963       * this function removes all existing shortcodes, registers the [embed] shortcode,
 964       * calls {@link do_shortcode()}, and then re-registers the old shortcodes.
 965       *
 966       * @uses $shortcode_tags
 967       * @uses remove_all_shortcodes()
 968       * @uses add_shortcode()
 969       * @uses do_shortcode()
 970       *
 971       * @param string $content Content to parse
 972       * @return string Content with shortcode parsed
 973       */
 974  	function run_shortcode( $content ) {
 975          global $shortcode_tags;
 976  
 977          // Backup current registered shortcodes and clear them all out
 978          $orig_shortcode_tags = $shortcode_tags;
 979          remove_all_shortcodes();
 980  
 981          add_shortcode( 'embed', array(&$this, 'shortcode') );
 982  
 983          // Do the shortcode (only the [embed] one is registered)
 984          $content = do_shortcode( $content );
 985  
 986          // Put the original shortcodes back
 987          $shortcode_tags = $orig_shortcode_tags;
 988  
 989          return $content;
 990      }
 991  
 992      /**
 993       * If a post/page was saved, then output Javascript to make
 994       * an AJAX request that will call WP_Embed::cache_oembed().
 995       */
 996  	function maybe_run_ajax_cache() {
 997          global $post_ID;
 998  
 999          if ( empty($post_ID) || empty($_GET['message']) || 1 != $_GET['message'] )
1000              return;
1001  
1002  ?>
1003  <script type="text/javascript">
1004  /* <![CDATA[ */
1005      jQuery(document).ready(function($){
1006          $.get("<?php echo admin_url( 'admin-ajax.php?action=oembed-cache&post=' . $post_ID ); ?>");
1007      });
1008  /* ]]> */
1009  </script>
1010  <?php
1011      }
1012  
1013      /**
1014       * Register an embed handler. Do not use this function directly, use {@link wp_embed_register_handler()} instead.
1015       * This function should probably also only be used for sites that do not support oEmbed.
1016       *
1017       * @param string $id An internal ID/name for the handler. Needs to be unique.
1018       * @param string $regex The regex that will be used to see if this handler should be used for a URL.
1019       * @param callback $callback The callback function that will be called if the regex is matched.
1020       * @param int $priority Optional. Used to specify the order in which the registered handlers will be tested (default: 10). Lower numbers correspond with earlier testing, and handlers with the same priority are tested in the order in which they were added to the action.
1021       */
1022  	function register_handler( $id, $regex, $callback, $priority = 10 ) {
1023          $this->handlers[$priority][$id] = array(
1024              'regex'    => $regex,
1025              'callback' => $callback,
1026          );
1027      }
1028  
1029      /**
1030       * Unregister a previously registered embed handler. Do not use this function directly, use {@link wp_embed_unregister_handler()} instead.
1031       *
1032       * @param string $id The handler ID that should be removed.
1033       * @param int $priority Optional. The priority of the handler to be removed (default: 10).
1034       */
1035  	function unregister_handler( $id, $priority = 10 ) {
1036          if ( isset($this->handlers[$priority][$id]) )
1037              unset($this->handlers[$priority][$id]);
1038      }
1039  
1040      /**
1041       * The {@link do_shortcode()} callback function.
1042       *
1043       * Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of the registered embed handlers.
1044       * If none of the regex matches and it's enabled, then the URL will be given to the {@link WP_oEmbed} class.
1045       *
1046       * @uses wp_oembed_get()
1047       * @uses wp_parse_args()
1048       * @uses wp_embed_defaults()
1049       * @uses WP_Embed::maybe_make_link()
1050       * @uses get_option()
1051       * @uses current_user_can()
1052       * @uses wp_cache_get()
1053       * @uses wp_cache_set()
1054       * @uses get_post_meta()
1055       * @uses update_post_meta()
1056       *
1057       * @param array $attr Shortcode attributes.
1058       * @param string $url The URL attempting to be embeded.
1059       * @return string The embed HTML on success, otherwise the original URL.
1060       */
1061  	function shortcode( $attr, $url = '' ) {
1062          global $post;
1063  
1064          if ( empty($url) )
1065              return '';
1066  
1067          $rawattr = $attr;
1068          $attr = wp_parse_args( $attr, wp_embed_defaults() );
1069  
1070          // Look for known internal handlers
1071          ksort( $this->handlers );
1072          foreach ( $this->handlers as $priority => $handlers ) {
1073              foreach ( $handlers as $id => $handler ) {
1074                  if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) {
1075                      if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) )
1076                          return apply_filters( 'embed_handler_html', $return, $url, $attr );
1077                  }
1078              }
1079          }
1080  
1081          $post_ID = ( !empty($post->ID) ) ? $post->ID : null;
1082          if ( !empty($this->post_ID) ) // Potentially set by WP_Embed::cache_oembed()
1083              $post_ID = $this->post_ID;
1084  
1085          // Unknown URL format. Let oEmbed have a go.
1086          if ( $post_ID ) {
1087  
1088              // Check for a cached result (stored in the post meta)
1089              $cachekey = '_oembed_' . md5( $url . serialize( $attr ) );
1090              if ( $this->usecache ) {
1091                  $cache = get_post_meta( $post_ID, $cachekey, true );
1092  
1093                  // Failures are cached
1094                  if ( '{{unknown}}' === $cache )
1095                      return $this->maybe_make_link( $url );
1096  
1097                  if ( !empty($cache) )
1098                      return apply_filters( 'embed_oembed_html', $cache, $url, $attr );
1099              }
1100  
1101              // Use oEmbed to get the HTML
1102              $attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) ) ? true : false;
1103              $html = wp_oembed_get( $url, $attr );
1104  
1105              // Cache the result
1106              $cache = ( $html ) ? $html : '{{unknown}}';
1107              update_post_meta( $post_ID, $cachekey, $cache );
1108  
1109              // If there was a result, return it
1110              if ( $html )
1111                  return apply_filters( 'embed_oembed_html', $html, $url, $attr );
1112          }
1113  
1114          // Still unknown
1115          return $this->maybe_make_link( $url );
1116      }
1117  
1118      /**
1119       * Delete all oEmbed caches.
1120       *
1121       * @param int $post_ID Post ID to delete the caches for.
1122       */
1123  	function delete_oembed_caches( $post_ID ) {
1124          $post_metas = get_post_custom_keys( $post_ID );
1125          if ( empty($post_metas) )
1126              return;
1127  
1128          foreach( $post_metas as $post_meta_key ) {
1129              if ( '_oembed_' == substr( $post_meta_key, 0, 8 ) )
1130                  delete_post_meta( $post_ID, $post_meta_key );
1131          }
1132      }
1133  
1134      /**
1135       * Triggers a caching of all oEmbed results.
1136       *
1137       * @param int $post_ID Post ID to do the caching for.
1138       */
1139  	function cache_oembed( $post_ID ) {
1140          $post = get_post( $post_ID );
1141  
1142          if ( empty($post->ID) || !in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', array( 'post', 'page' ) ) ) )
1143              return;
1144  
1145          // Trigger a caching
1146          if ( !empty($post->post_content) ) {
1147              $this->post_ID = $post->ID;
1148              $this->usecache = false;
1149  
1150              $content = $this->run_shortcode( $post->post_content );
1151              if ( get_option('embed_autourls') )
1152                  $this->autoembed( $content );
1153  
1154              $this->usecache = true;
1155          }
1156      }
1157  
1158      /**
1159       * Passes any unlinked URLs that are on their own line to {@link WP_Embed::shortcode()} for potential embedding.
1160       *
1161       * @uses WP_Embed::autoembed_callback()
1162       *
1163       * @param string $content The content to be searched.
1164       * @return string Potentially modified $content.
1165       */
1166  	function autoembed( $content ) {
1167          return preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array(&$this, 'autoembed_callback'), $content );
1168      }
1169  
1170      /**
1171       * Callback function for {@link WP_Embed::autoembed()}.
1172       *
1173       * @uses WP_Embed::shortcode()
1174       *
1175       * @param array $match A regex match array.
1176       * @return string The embed HTML on success, otherwise the original URL.
1177       */
1178  	function autoembed_callback( $match ) {
1179          $oldval = $this->linkifunknown;
1180          $this->linkifunknown = false;
1181          $return = $this->shortcode( array(), $match[1] );
1182          $this->linkifunknown = $oldval;
1183  
1184          return "\n$return\n";
1185      }
1186  
1187      /**
1188       * Conditionally makes a hyperlink based on an internal class variable.
1189       *
1190       * @param string $url URL to potentially be linked.
1191       * @return string Linked URL or the original URL.
1192       */
1193  	function maybe_make_link( $url ) {
1194          $output = ( $this->linkifunknown ) ? '<a href="' . esc_attr($url) . '">' . esc_html($url) . '</a>' : $url;
1195          return apply_filters( 'embed_maybe_make_link', $output, $url );
1196      }
1197  }
1198  $wp_embed = new WP_Embed();
1199  
1200  /**
1201   * Register an embed handler. This function should probably only be used for sites that do not support oEmbed.
1202   *
1203   * @since 2.9.0
1204   * @see WP_Embed::register_handler()
1205   */
1206  function wp_embed_register_handler( $id, $regex, $callback, $priority = 10 ) {
1207      global $wp_embed;
1208      $wp_embed->register_handler( $id, $regex, $callback, $priority );
1209  }
1210  
1211  /**
1212   * Unregister a previously registered embed handler.
1213   *
1214   * @since 2.9.0
1215   * @see WP_Embed::unregister_handler()
1216   */
1217  function wp_embed_unregister_handler( $id, $priority = 10 ) {
1218      global $wp_embed;
1219      $wp_embed->unregister_handler( $id, $priority );
1220  }
1221  
1222  /**
1223   * Create default array of embed parameters.
1224   *
1225   * @since 2.9.0
1226   *
1227   * @return array Default embed parameters.
1228   */
1229  function wp_embed_defaults() {
1230      if ( !empty($GLOBALS['content_width']) )
1231          $theme_width = (int) $GLOBALS['content_width'];
1232  
1233      $width = get_option('embed_size_w');
1234  
1235      if ( !$width && !empty($theme_width) )
1236          $width = $theme_width;
1237  
1238      if ( !$width )
1239          $width = 500;
1240  
1241      return apply_filters( 'embed_defaults', array(
1242          'width' => $width,
1243          'height' => 700,
1244      ) );
1245  }
1246  
1247  /**
1248   * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height.
1249   *
1250   * @since 2.9.0
1251   * @uses wp_constrain_dimensions() This function passes the widths and the heights.
1252   *
1253   * @param int $example_width The width of an example embed.
1254   * @param int $example_height The height of an example embed.
1255   * @param int $max_width The maximum allowed width.
1256   * @param int $max_height The maximum allowed height.
1257   * @return array The maximum possible width and height based on the example ratio.
1258   */
1259  function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) {
1260      $example_width  = (int) $example_width;
1261      $example_height = (int) $example_height;
1262      $max_width      = (int) $max_width;
1263      $max_height     = (int) $max_height;
1264  
1265      return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height );
1266  }
1267  
1268  /**
1269   * Attempts to fetch the embed HTML for a provided URL using oEmbed.
1270   *
1271   * @since 2.9.0
1272   * @see WP_oEmbed
1273   *
1274   * @uses _wp_oembed_get_object()
1275   * @uses WP_oEmbed::get_html()
1276   *
1277   * @param string $url The URL that should be embeded.
1278   * @param array $args Addtional arguments and parameters.
1279   * @return string The original URL on failure or the embed HTML on success.
1280   */
1281  function wp_oembed_get( $url, $args = '' ) {
1282      require_once ( 'class-oembed.php' );
1283      $oembed = _wp_oembed_get_object();
1284      return $oembed->get_html( $url, $args );
1285  }
1286  
1287  /**
1288   * Adds a URL format and oEmbed provider URL pair.
1289   *
1290   * @since 2.9.0
1291   * @see WP_oEmbed
1292   *
1293   * @uses _wp_oembed_get_object()
1294   *
1295   * @param string $format The format of URL that this provider can handle. You can use asterisks as wildcards.
1296   * @param string $provider The URL to the oEmbed provider.
1297   * @param boolean $regex Whether the $format parameter is in a regex format or not.
1298   */
1299  function wp_oembed_add_provider( $format, $provider, $regex = false ) {
1300      require_once ( 'class-oembed.php' );
1301      $oembed = _wp_oembed_get_object();
1302      $oembed->providers[$format] = array( $provider, $regex );
1303  }