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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 |
---|---|
642 | * @param unknown_type $mid |
643 | * @return unknown |
644 | */ |
645 | function delete_meta( $mid ) { |
646 | global $wpdb; |
647 | $mid = (int) $mid; |
648 |
|
649 | $post_id = $wpdb->get_var( $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_id = %d", $mid) ); |
650 |
|
651 | do_action( 'delete_postmeta', $mid ); |
652 | wp_cache_delete($post_id, 'post_meta'); |
653 | $rval = $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE meta_id = %d", $mid) ); |
654 | do_action( 'deleted_postmeta', $mid ); |
655 |
|
656 | return $rval; |
657 | } |
658 |
|
659 | /** |
660 | * Get a list of previously defined keys. |