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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 152 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 153 | |
| 154 | $wpdb->update( $table, $data, $where ); |
| 155 | |
| 156 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 157 | |
| 158 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 159 | |
| 160 | if ( 'post' == $meta_type ) |
| 161 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 162 | |
| 163 | return true; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Delete metadata for the specified object. |
| 168 | * |
| 169 | * @since 2.9.0 |
| 170 | * @uses $wpdb WordPress database object for queries. |
| Line | Code |
| 437 | // Run the update query, all fields in $data are %s, $where is a %d. |
| 438 | $result = (bool) $wpdb->update( $table, $data, $where, '%s', '%d' ); |
| 439 | |
| 440 | // Clear the caches. |
| 441 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 442 | |
| 443 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 444 | |
| 445 | if ( 'post' == $meta_type ) |
| 446 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 447 | |
| 448 | return $result; |
| 449 | } |
| 450 | |
| 451 | // And if the meta was not found. |
| 452 | return false; |
| 453 | } |
| 454 | |
| 455 | /** |