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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 |
|---|---|
| 238 | wp_cache_delete($o_id, $meta_type . '_meta'); |
| 239 | } |
| 240 | } else { |
| 241 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 242 | } |
| 243 | |
| 244 | do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 245 | |
| 246 | if ( 'post' == $meta_type ) |
| 247 | do_action( 'deleted_postmeta', $meta_ids ); |
| 248 | |
| 249 | return true; |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Retrieve metadata for the specified object. |
| 254 | * |
| 255 | * @since 2.9.0 |
| 256 | * |
| Line | Code |
| 491 | // Run the query, will return true if deleted, false otherwise |
| 492 | $result = (bool) $wpdb->query( $wpdb->prepare( "DELETE FROM $table WHERE $id_column = %d LIMIT 1;", $meta_id ) ); |
| 493 | |
| 494 | // Clear the caches. |
| 495 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 496 | |
| 497 | do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 498 | |
| 499 | if ( 'post' == $meta_type ) |
| 500 | do_action( 'deleted_postmeta', $meta_id ); |
| 501 | |
| 502 | return $result; |
| 503 | |
| 504 | } |
| 505 | |
| 506 | // Meta id was not found. |
| 507 | return false; |
| 508 | } |
| 509 | |