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Source View: update_{$meta_type}_metadata

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Line Code
182       *
183       * @param null|bool $check      Whether to allow updating metadata for the given type.
184       * @param int       $object_id  Object ID.
185       * @param string    $meta_key   Meta key.
186       * @param mixed     $meta_value Meta value. Must be serializable if non-scalar.
187       * @param mixed     $prev_value Optional. If specified, only update existing
188       *                              metadata entries with the specified value.
189       *                              Otherwise, update all entries.
190       */
191      $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value );
192      if ( null !== $check )
193           return (bool) $check;
194
195      // Compare existing value to new value if no prev value given and the key exists only once.
196      if ( empty($prev_value) ) {
197           $old_value = get_metadata($meta_type, $object_id, $meta_key);
198           if ( count($old_value) == 1 ) {
199                if ( $old_value[0] === $meta_value )
200                     return false;