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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 |
---|---|
416 | // Old-style action. |
417 | if ( 'post' == $meta_type ) { |
418 | /** |
419 | * Fires immediately before deleting metadata for a post. |
420 | * |
421 | * @since 2.9.0 |
422 | * |
423 | * @param array $meta_ids An array of post metadata entry IDs to delete. |
424 | */ |
425 | do_action( 'delete_postmeta', $meta_ids ); |
426 | } |
427 |
|
428 | $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . ' )'; |
429 |
|
430 | $count = $wpdb->query( $query ); |
431 |
|
432 | if ( ! $count ) { |
433 | return false; |
434 | } |