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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.
| Line | Code |
|---|---|
| 487 | |
| 488 | // Fetch the meta and go on if it's found. |
| 489 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
| 490 | $object_id = $meta->{$column}; |
| 491 | |
| 492 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 493 | |
| 494 | // Old-style action. |
| 495 | if ( 'post' == $meta_type || 'comment' == $meta_type ) |
| 496 | do_action( "delete_{$meta_type}meta", $meta_id ); |
| 497 | |
| 498 | // Run the query, will return true if deleted, false otherwise |
| 499 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 500 | |
| 501 | // Clear the caches. |
| 502 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 503 | |
| 504 | do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 505 | |