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/sites/all/modules/date/ -> date_api_elements.inc (source)

   1  <?php
   2  /**
   3   * @file
   4   * Date API elements themes and validation.
   5   * This file is only included during the edit process to reduce memory usage.
   6   */
   7  
   8  /**
   9   * Implementation of hook_elements().
  10   *
  11   * Parameters for date form elements, designed to have sane defaults so any
  12   * or all can be omitted.
  13   *
  14   * Fill the element #default_value with a date in datetime format,
  15   * (YYYY-MM-DD HH:MM:SS), adjusted to the proper local timezone.
  16   *
  17   * NOTE - Converting a date stored in the database from UTC to the local zone
  18   * and converting it back to UTC before storing it is not handled by this
  19   * element and must be done in pre-form and post-form processing!!
  20   *
  21   * The date_select element will create a collection of form elements, with a
  22   * separate select or textfield for each date part. The whole collection will
  23   * get re-formatted back into a date value of the requested type during validation.
  24   *
  25   * The date_text element will create a textfield that can contain a whole
  26   * date or any part of a date as text. The user input value will be re-formatted
  27   * back into a date value of the requested type during validation.
  28   *
  29   * The date_timezone element will create a drop-down selector to pick a
  30   * timezone name.
  31   *
  32   * #date_timezone
  33   *   The local timezone to be used to create this date.
  34   *
  35   * #date_format
  36   *   A format string that describes the format and order of date parts to
  37   *   display in the edit form for this element. This makes it possible
  38   *   to show date parts in a custom order, or to leave some of them out.
  39   *   Be sure to add 'A' or 'a' to get an am/pm selector. Defaults to the
  40   *   short site default format.
  41   *
  42   * #date_label_position
  43   *   Handling option for date part labels, like 'Year', 'Month', and 'Day',
  44   *   can be 'above' the date part, 'within' it, or 'none', default is 'above'.
  45   *   The 'within' option shows the label as the first option in a select list
  46   *   or the default value for an empty textfield, taking up less screen space.
  47   *
  48   * #date_increment
  49   *   Increment minutes and seconds by this amount, default is 1.
  50   *
  51   * #date_year_range
  52   *   The number of years to go back and forward in a year selector,
  53   *   default is -3:+3 (3 back and 3 forward).
  54   *
  55   * #date_text_parts
  56   *   Array of date parts that should use textfields instead of selects
  57   *   i.e. array('year') will format the year as a textfield and other
  58   *   date parts as drop-down selects.
  59   */
  60  function _date_api_elements() {
  61    $date_base = array(
  62      '#input' => TRUE, '#tree' => TRUE,
  63      '#date_timezone' => date_default_timezone_name(),
  64      '#date_format' => variable_get('date_format_short', 'm/d/Y - H:i'),
  65      '#date_text_parts' => array(),
  66      '#date_increment' => 1,
  67      '#date_year_range' => '-3:+3',
  68      '#date_label_position' => 'above',
  69      );
  70    $type['date_select'] = array_merge($date_base, array(
  71      '#process' => array('date_select_process'),
  72      ));
  73    $type['date_text'] = array_merge($date_base, array(
  74      '#process' => array('date_text_process'),
  75      ));
  76    $type['date_timezone'] = array(
  77      '#input' => TRUE, '#tree' => TRUE,
  78      '#process' => array('date_timezone_process'),
  79      );
  80    return $type;
  81  }
  82  
  83  /**
  84   * Create a timezone form element.
  85   *
  86   * @param array $element
  87   * @return array
  88   *   the timezone form element
  89   */
  90  function date_timezone_process($element, $edit, $form_state, $form) {
  91    $element['#tree'] = TRUE;
  92    $element['timezone'] = array(
  93      '#type' => 'select',
  94      '#title' => theme('date_part_label_timezone', 'select', $element),
  95      '#default_value' => $element['#value'],
  96      '#options' => date_timezone_names($element['#required']),
  97      '#weight' => $element['#weight'],
  98      '#required' => $element['#required'],
  99      '#theme' => 'date_select_element',
 100    );
 101    if (isset($element['#element_validate'])) {
 102      array_push($element['#element_validate'], 'date_timezone_validate');
 103    }
 104    else {
 105      $element['#element_validate'] = array('date_timezone_validate');
 106    }
 107    // TODO This sometimes causes problems, do we need it?
 108    //$element['#attributes'] = array('class' => 'date-timezone clear-block');
 109    return $element;
 110  }
 111  
 112  /**
 113   * Text date input form.
 114   *
 115   * Display all or part of a date in a single textfield.
 116   *
 117   * The exact parts displayed in the field are those in #date_granularity.
 118   * The display of each part comes from #date_format.
 119   * 
 120   * In regular FAPI processing $element['#value'] will contain a string
 121   * value before the form is submitted, and an array during submission.
 122   * 
 123   * In regular FAPI processing $edit is empty until the form is submitted
 124   * when it will contain an array.
 125   * 
 126   * Views widget processing now receives the same values as normal FAPI
 127   * processing (that was not true in Views 1).
 128   * 
 129   */
 130  function date_text_process($element, $edit, $form_state, $form) {
 131    $date = NULL;
 132    $granularity = date_format_order($element['#date_format']);
 133  
 134    // We sometimes get $edit without $edit['date'] from
 135    // Views exposed filters.
 136    if (!empty($edit) && is_array($edit) && !empty($edit['date'])) {
 137      $datetime = date_convert_from_custom($edit['date'], $element['#date_format']);
 138      $date = date_make_date($datetime, $element['#date_timezone'], DATE_DATETIME, $granularity);
 139    }
 140    elseif (!empty($element['#value'])) {
 141      $date = date_make_date($element['#value'], $element['#date_timezone'], DATE_DATETIME, $granularity);
 142    }
 143    $element['#tree'] = TRUE;
 144  
 145    $element['date']['#type'] = 'textfield';
 146    $element['date']['#weight'] = !empty($element['date']['#weight']) ? $element['date']['#weight'] : $element['#weight'];
 147    $element['date']['#default_value'] = is_object($date) ? date_format_date($date , 'custom', $element['#date_format']) : '';
 148    $element['date']['#attributes'] = array('class' => (isset($element['#attributes']['class']) ? $element['#attributes']['class'] : '') .' date-date');
 149    $element['date']['#description'] = ' '. t('Format: @date', array('@date' => date_format_date(date_now(), 'custom', $element['#date_format'])));
 150  
 151    // Keep the system from creating an error message for the sub-element.
 152    // We'll set our own message on the parent element.
 153    //$element['date']['#required'] = $element['#required'];
 154    $element['date']['#theme'] = 'date_textfield_element';
 155    if (isset($element['#element_validate'])) {
 156      array_push($element['#element_validate'], 'date_text_validate');
 157    }
 158    else {
 159      $element['#element_validate'] = array('date_text_validate');
 160    }
 161    if (!empty($element['#force_value'])) {
 162      $element['date']['#value'] = $element['date']['#default_value'];
 163    }
 164    return $element;
 165  }
 166  
 167  /**
 168   * Flexible date/time drop-down selector.
 169   *
 170   * Splits date into a collection of date and time sub-elements, one
 171   * for each date part. Each sub-element can be either a textfield or a
 172   * select, based on the value of ['#date_settings']['text_fields'].
 173   *
 174   * The exact parts displayed in the field are those in #date_granularity.
 175   * The display of each part comes from ['#date_settings']['format'].
 176   * 
 177   * In regular FAPI processing $element['#value'] will contain a string
 178   * value before the form is submitted, and an array during submission.
 179   * 
 180   * In regular FAPI processing $edit is empty until the form is submitted
 181   * when it will contain an array.
 182   * 
 183   * Views widget processing now receives the same values as normal FAPI
 184   * processing (that was not true in Views 1).
 185   * 
 186   */
 187  function date_select_process($element, $edit, $form_state, $form) {
 188    $date = NULL;
 189    $granularity = date_format_order($element['#date_format']);
 190    if (!empty($edit)) {
 191      $date = date_make_date($edit, $element['#date_timezone'], DATE_ARRAY, $granularity);
 192    }
 193    elseif (!empty($element['#value'])) {
 194      $date = date_make_date($element['#value'], $element['#date_timezone'], DATE_DATETIME, $granularity);
 195    }
 196  
 197    $element['#tree'] = TRUE;
 198    date_increment_round($date, $element['#date_increment']);
 199    $element += (array) date_parts_element($element, $date, $element['#date_format']);
 200  
 201    // Store a hidden value for all date parts not in the current display.
 202    $granularity = date_format_order($element['#date_format']);
 203    $formats = array('year' => 'Y', 'month' => 'n', 'day' => 'j', 'hour' => 'H', 'minute' => 'i', 'second' => 's');
 204    foreach (date_nongranularity($granularity) as $field) {
 205      if ($field != 'timezone') {
 206        $element[$field] = array(
 207          '#type' => 'value',
 208          '#value' => 0,
 209          );
 210      }
 211    }
 212    if (isset($element['#element_validate'])) {
 213      array_push($element['#element_validate'], 'date_select_validate');
 214    }
 215    else {
 216      $element['#element_validate'] = array('date_select_validate');
 217    }
 218  
 219    return $element;
 220  }
 221  
 222  /**
 223   * Create form elements for one or more date parts.
 224   *
 225   * Get the order of date elements from the provided format.
 226   * If the format order omits any date parts in the granularity, alter the
 227   * granularity array to match the format, then flip the $order array
 228   * to get the position for each element. Then iterate through the
 229   * elements and create a sub-form for each part.
 230   *
 231   * @param array $element
 232   * @param object $date
 233   * @param array $granularity
 234   * @param string $format
 235   * @return array
 236   *   the form array for the submitted date parts
 237   */
 238  function date_parts_element($element, $date, $format) {
 239    $granularity = date_format_order($format);
 240    $sub_element = array('#granularity' => $granularity);
 241    $order = array_flip($granularity);
 242  
 243    $hours_format  = strpos(strtolower($element['#date_format']), 'a') ? 'g': 'G';
 244    $month_function  = strpos($element['#date_format'], 'F') !== FALSE ? 'date_month_names' : 'date_month_names_abbr';
 245    $count = 0;
 246    $increment = min(intval($element['#date_increment']), 1);
 247    foreach ($granularity as $field) {
 248      // Allow empty value as option if date is not required 
 249      // or if empty value was provided as a starting point.
 250      $part_required = ($element['#required'] && is_object($date)) ? TRUE : FALSE;
 251      $part_type = in_array($field, $element['#date_text_parts']) ? 'textfield' : 'select';
 252      $sub_element[$field] = array(
 253        '#weight' => $order[$field],
 254        '#required' => $element['#required'],
 255        '#attributes' => array('class' => (isset($element['#attributes']['class']) ? $element['#attributes']['class'] : '') .' date-'. $field),
 256        );
 257      switch ($field) {
 258        case 'year':
 259          $range = date_range_years($element['#date_year_range'], $date);
 260          $min_year = $range[0];
 261          $max_year = $range[1];
 262  
 263          $sub_element[$field]['#default_value'] = is_object($date) ? date_format($date, 'Y') : '';
 264          if ($part_type == 'select') {
 265            $sub_element[$field]['#options'] = drupal_map_assoc(date_years($min_year, $max_year, $part_required));
 266          }
 267          break;
 268        case 'month':
 269          $sub_element[$field]['#default_value'] = is_object($date) ? date_format($date, 'n') : '';
 270          if ($part_type == 'select') {
 271            $sub_element[$field]['#options'] = $month_function($part_required);
 272          }
 273          break;
 274        case 'day':
 275          $sub_element[$field]['#default_value'] = is_object($date) ? date_format($date, 'j') : '';
 276          if ($part_type == 'select') {
 277            $sub_element[$field]['#options'] = drupal_map_assoc(date_days($part_required));
 278          }
 279          break;
 280        case 'hour':
 281          $sub_element[$field]['#default_value'] = is_object($date) ? date_format($date, $hours_format) : '';
 282          if ($part_type == 'select') {
 283            $sub_element[$field]['#options'] = drupal_map_assoc(date_hours($hours_format, $part_required));
 284          }
 285          $sub_element[$field]['#prefix'] = theme('date_part_hour_prefix', $element);
 286          break;
 287        case 'minute':
 288          $sub_element[$field]['#default_value'] = is_object($date) ? date_format($date, 'i') : '';
 289          if ($part_type == 'select') {
 290            $sub_element[$field]['#options'] = drupal_map_assoc(date_minutes('i', $part_required, $element['#date_increment']));
 291          }
 292          $sub_element[$field]['#prefix'] = theme('date_part_minsec_prefix', $element);
 293          break;
 294        case 'second':
 295          $sub_element[$field]['#default_value'] = is_object($date) ? date_format($date, 's') : '';
 296          if ($part_type == 'select') {
 297            $sub_element[$field]['#options'] = drupal_map_assoc(date_seconds('s', $part_required, $element['#date_increment']));
 298          }
 299          $sub_element[$field]['#prefix'] = theme('date_part_minsec_prefix', $element);
 300          break;
 301      }
 302  
 303      // Add handling for the date part label.
 304      $label = theme('date_part_label_'. $field, $part_type, $element);
 305      if (in_array($field, $element['#date_text_parts'])) {
 306        $sub_element[$field]['#type'] = 'textfield';
 307        $sub_element[$field]['#theme'] = 'date_textfield_element';
 308        $sub_element[$field]['#size'] = 7;
 309        if ($element['#date_label_position'] == 'within') {
 310          if (is_array($sub_element[$field]['#options'])) {
 311            $sub_element[$field]['#options'] = array(
 312              '-'. $label => '-'. $label) + $sub_element[$field]['#options'];
 313          }
 314          if (empty($sub_element[$field]['#default_value'])) {
 315            $sub_element[$field]['#default_value'] = '-'. $label;
 316          }
 317        }
 318        elseif ($element['#date_label_position'] != 'none') {
 319          $sub_element[$field]['#title'] = $label;
 320        }
 321      }
 322      else {
 323        $sub_element[$field]['#type'] = 'select';
 324        $sub_element[$field]['#theme'] = 'date_select_element';
 325        if ($element['#date_label_position'] == 'within') {
 326          $sub_element[$field]['#options'] = array(
 327            '' => '-'. $label) + $sub_element[$field]['#options'];
 328        }
 329        elseif ($element['#date_label_position'] != 'none') {
 330          $sub_element[$field]['#title'] = $label;
 331        }
 332      }
 333  
 334      // Views exposed filters are treated as submitted even if not,
 335      // so force the #default value in that case. Make sure we set
 336      // a default that is in the option list.
 337      if (!empty($element['#force_value'])) {
 338        $options = $sub_element[$field]['#options'];
 339        $default = !empty($sub_element[$field]['#default_value']) ? $sub_element[$field]['#default_value'] : array_shift($options);
 340        $sub_element[$field]['#value'] = $default;
 341      }
 342    }
 343  
 344    if (($hours_format == 'g' || $hours_format == 'h') && date_has_time($granularity)) {
 345      $sub_element['ampm'] = array(
 346        '#type' => 'select',
 347        '#default_value' => is_object($date) ? (date_format($date, 'G') >= 12 ? 'pm' : 'am') : '',
 348        '#options' => drupal_map_assoc(date_ampm()),
 349        '#weight' => 8,
 350        '#attributes' => array('class' => 'date-ampm'),
 351      );
 352      if ($element['#date_label_position'] == 'within') {
 353        $sub_element['ampm']['#options'] = array('' => '-'. theme('date_part_label_ampm', 'ampm', $element)) + $sub_element['ampm']['#options'];
 354      }
 355      elseif ($element['#date_label_position'] != 'none') {
 356        $sub_element['ampm']['#title'] = theme('date_part_label_ampm', 'ampm', $element);
 357      }
 358    }
 359  
 360    return $sub_element;
 361  }
 362  
 363  /**
 364   *  Validation function for date selector.
 365   * 
 366   * When used as a Views widget, the validation step always gets triggered,
 367   * even with no form submission. Before form submission $element['#value']
 368   * contains a string, after submission it contains an array.
 369   * 
 370   */
 371  function date_select_validate($element, &$form_state) {
 372    if (is_string($element['#value'])) {
 373      return;
 374    }
 375    // Strip field labels out of the results.
 376    foreach ($element['#value'] as $field => $field_value) {
 377      if (substr($field_value, 0, 1) == '-') {
 378        $element['#value'][$field] = '';
 379      }
 380    }
 381  
 382    $error_field = implode('][', $element['#parents']);
 383    $errors = array();
 384    $label = !empty($element['#date_title']) ? $element['#date_title'] : (!empty($element['#title']) ? $element['#title'] : '');
 385  
 386    if (in_array('year', $element['#granularity']) && ($element['#required'] || !empty($element['#value']['year']))) {
 387      if ($element['#value']['year'] < variable_get('date_min_year', 1) || $element['#value']['year'] > variable_get('date_max_year', 4000)) {
 388        $errors[] = t('The year must be a number between %min and %max.', array(
 389          '%min' => variable_get('date_min_year', 1), '%max' => variable_get('date_max_year', 4000)));  
 390      }
 391      else {
 392        $year = $element['#value']['year'];
 393      }
 394    }
 395    if (in_array('month', $element['#granularity']) && ($element['#required'] || !empty($element['#value']['month']))) {
 396      if ($element['#value']['month'] < 1 || $element['#value']['month'] > 12) {
 397        $errors[] = t('The month must be a number between 1 and 12.');
 398      }
 399      else {
 400        $month = $element['#value']['month'];
 401      }
 402    }
 403    if (in_array('day', $element['#granularity']) && ($element['#required'] || !empty($element['#value']['day']))) {
 404      $min = 1;
 405      $max = isset($year) && isset($month) ? date_days_in_month($year, $month) : 31;
 406      if ($element['#value']['day'] < $min || $element['#value']['day'] > $max) {
 407        $errors[] = t('The day must be a number between !min and !max.', array('!min' => $min, '!max' => $max));
 408      }
 409    }
 410    if (in_array('hour', $element['#granularity']) && ($element['#required'] || !empty($element['#value']['hour']))) {
 411      $min = isset($element['#value']['ampm']) ? 1 : 0;
 412      $max = isset($element['#value']['ampm']) ? 12 : 23;
 413      if ($element['#value']['hour'] < $min || $element['#value']['hour'] > $max) {
 414        $errors[] = t('The hour must be a number between !min and !max.', array('!min' => $min, '!max' => $max));
 415      }
 416    }
 417    if (in_array('minute', $element['#granularity']) && ($element['#required'] || !empty($element['#value']['minute']))) {
 418      $min = 0;
 419      $max = 59;
 420      if ($element['#value']['minute'] < $min || $element['#value']['minute'] > $max) {
 421        $errors[] = t('The minute must be a number between !min and !max.', array('!min' => $min, '!max' => $max));
 422      }
 423    }
 424    if (in_array('second', $element['#granularity']) && ($element['#required'] || !empty($element['#value']['second']))) {
 425      $min = 0;
 426      $max = 59;
 427      if ($element['#value']['second'] < $min || $element['#value']['second'] > $max) {
 428        $errors[] = t('The second must be a number between !min and !max.', array('!min' => $min, '!max' => $max));
 429      }
 430    }
 431    if (isset($element['#value']['ampm'])) {
 432      if ($element['#value']['ampm'] == 'pm' && $element['#value']['hour'] < 12) {
 433        $element['#value']['hour'] += 12;
 434      }
 435      elseif ($element['#value']['ampm'] == 'am' && $element['#value']['hour'] == 12) {
 436        $element['#value']['hour'] -= 12;
 437      }
 438    }
 439    $value = date_select_input_value($element);
 440    if (empty($value) && empty($errors) && $element['#required']) {
 441      $errors[] = t('A valid value is required.');
 442    }
 443    if (!empty($errors)) {
 444      array_unshift($errors, t('Field %field has errors.', array('%field' => $label)));
 445      form_set_error($error_field, implode(' ', $errors));
 446    }
 447    // If there are no errors and the value is valid, set it.
 448    if (empty($errors) && !empty($value)) {
 449      form_set_value($element, $value, $form_state);
 450    }
 451    else {
 452      form_set_value($element, NULL, $form_state);
 453    }
 454  }
 455  
 456  /**
 457   * Helper function for extracting a date value out of user input.
 458   */
 459  function date_select_input_value($element) {
 460    $granularity = date_format_order($element['#date_format']);
 461    if (date_is_valid($element['#value'], DATE_ARRAY, $granularity)) {
 462      // Use fuzzy_datetime here to be sure year-only dates
 463      // aren't inadvertantly shifted to the wrong year by trying
 464      // to save '2009-00-00 00:00:00'.
 465      return date_fuzzy_datetime(date_convert($element['#value'], DATE_ARRAY, DATE_DATETIME));
 466    }
 467    return NULL;
 468  }
 469  
 470  /**
 471   *  Validation for text input.
 472   * 
 473   * When used as a Views widget, the validation step always gets triggered,
 474   * even with no form submission. Before form submission $element['#value']
 475   * contains a string, after submission it contains an array.
 476   * 
 477   */
 478  function date_text_validate($element, &$form_state) {
 479    if (is_string($element['#value'])) {
 480      return;
 481    }
 482    $parents = $element['#parents'];
 483    $label = !empty($element['#date_title']) ? $element['#date_title'] : (!empty($element['#title']) ? $element['#title'] : '');
 484    $value = date_text_input_value($element);
 485  
 486    if (empty($value) && !empty($element['#required'])) {
 487      form_error($element, t('A valid date is required for %title.', array('%title' => $label))); 
 488    }
 489    elseif (empty($value) && !empty($element['#value']['date'])) {
 490      form_error($element, t('%title is invalid.', array('%title' => $label))); 
 491    }
 492    elseif (!empty($value)) {
 493      form_set_value($element, $value, $form_state);
 494    }
 495  }
 496  
 497  /**
 498   * Helper function for extracting a date value out of user input.
 499   */
 500  function date_text_input_value($element) {
 501    $form_values = $element['#value'];
 502    $granularity = date_format_order($element['#date_format']);
 503    $input = $form_values['date'];
 504    if (!$element['#required'] && trim($input) == '') return NULL;
 505  
 506    $value = date_limit_value(date_convert_from_custom($input, $element['#date_format']), $granularity);
 507  
 508    // If it creates a valid date, use it.
 509    if (date_is_valid($value, DATE_DATETIME, $granularity)) {
 510      return $value;
 511    }
 512    // TODO come back and try to find a way to use strtotime to guess
 513    // a valid value. Previous attempts to do it were too forgiving and
 514    // invalid input was just silently converted to 'now'.
 515    // See http://drupal.org/node/265076.
 516  
 517    return NULL;
 518  }
 519  
 520  /**
 521   *  Validation for timezone input
 522   *
 523   *  Move the timezone value from the nested field back to the original field.
 524   */
 525  function date_timezone_validate($element, &$form_state) {
 526    form_set_value($element, $element['#value']['timezone'], $form_state);
 527  }
 528  
 529  /**
 530   * Convert a date input in a custom format to a standard date type
 531   *
 532   * Handles conversion of translated month names (i.e. turns t('Mar') or
 533   * t('March') into 3). Also properly handles dates input in European style
 534   * short formats, like DD/MM/YYYY. Works by parsing the format string
 535   * to create a regex that can be used on the input value.
 536   *
 537   * The original code to do this was created by Yves Chedemois (yched).
 538   *
 539   * @param string $date
 540   *   a date value
 541   * @param string $format
 542   *   a date format string that describes the format of the input value
 543   * @return mixed
 544   *   input value converted to a DATE_DATETIME value
 545   */
 546  function date_convert_from_custom($date, $format) {
 547    $array = date_format_patterns();
 548    foreach ($array as $key => $value) {
 549      $patterns[] = "`(^|[^\\\\\\\\])". $key ."`"; // the letter with no preceding '\'
 550      $repl1[] = '$1}(.)';                  // a single character
 551      $repl2[] = '$1}('. $value .')';       // the
 552    }
 553    $patterns[] = "`\\\\\\\\([". implode(array_keys($array)) ."])`";
 554    $repl1[] = '$1}';
 555    $repl2[] = '$1}';
 556  
 557    $format_regexp = preg_quote($format);
 558  
 559    // extract letters
 560    $regex1 = preg_replace($patterns, $repl1, $format_regexp, 1);
 561    $regex1 = str_replace('A', '(.)', $regex1);
 562    $regex1 = str_replace('a', '(.)', $regex1);
 563    preg_match('`^'. $regex1 .'$`', stripslashes($format), $letters);
 564    array_shift($letters);
 565  
 566    // extract values
 567    $regex2 = preg_replace($patterns, $repl2, $format_regexp, 1);
 568    $regex2 = str_replace('A', '(AM|PM)', $regex2);
 569    $regex2 = str_replace('a', '(am|pm)', $regex2);
 570    preg_match('`^'. $regex2 .'$`', $date, $values);
 571    array_shift($values);
 572  
 573    // if we did not find all the values for the patterns in the format, abort
 574    if (count($letters) != count($values)) {
 575      return  NULL;
 576    }
 577    $final_date = array('hour' => 0, 'minute' => 0, 'second' => 0,
 578      'month' => 0, 'day' => 0, 'year' => 0);
 579    foreach ($letters as $i => $letter) {
 580      $value = $values[$i];
 581      switch ($letter) {
 582        case 'd':
 583        case 'j':
 584          $final_date['day'] = intval($value);
 585          break;
 586        case 'n':
 587        case 'm':
 588          $final_date['month'] = intval($value);
 589          break;
 590        case 'F':
 591          $array_month_long = array_flip(date_month_names());
 592          $final_date['month'] = $array_month_long[$value];
 593          break;
 594        case 'M':
 595          $array_month = array_flip(date_month_names_abbr());
 596          $final_date['month'] = $array_month[$value];
 597          break;
 598        case 'Y':
 599        case 'y':
 600          $year = $value;
 601          // if no century, we add the current one ("06" => "2006")
 602          $final_date['year'] = str_pad($year, 4, substr(date("Y"), 0, 2), STR_PAD_LEFT);
 603          break;
 604        case 'a':
 605        case 'A':
 606          $ampm = strtolower($value);
 607          break;
 608        case 'g':
 609        case 'h':
 610        case 'G':
 611        case 'H':
 612          $final_date['hour'] = intval($value);
 613          break;
 614        case 'i':
 615          $final_date['minute'] = intval($value);
 616          break;
 617        case 's':
 618          $final_date['second'] = intval($value);
 619          break;
 620        case 'U':
 621          return date_convert($value, DATE_UNIX, DATE_DATETIME);
 622          break;
 623      }
 624    }
 625    if (isset($ampm) && $ampm == 'pm' && $final_date['hour'] < 12) {
 626      $final_date['hour'] += 12;
 627    }
 628    elseif (isset($ampm) && $ampm == 'am' && $final_date['hour'] == 12) {
 629      $final_date['hour'] -= 12;
 630    }
 631    // Don't test for valid date, we might use this to extract
 632    // incomplete date part info from user input.
 633    return date_convert($final_date, DATE_ARRAY, DATE_DATETIME);
 634  }


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