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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 |
|---|---|
| 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 | |
| 506 | // Old-style action. |
| 507 | if ( 'post' == $meta_type || 'comment' == $meta_type ) |
| 508 | do_action( "deleted_{$meta_type}meta", $meta_id ); |
| 509 | |
| 510 | return $result; |
| 511 | |
| 512 | } |
| 513 | |
| 514 | // Meta id was not found. |
| 515 | return false; |
| 516 | } |
| 517 | |