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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 |
|---|---|
| 740 | $meta_value = maybe_serialize( stripslashes_deep( $meta_value ) ); |
| 741 | $meta_id = (int) $meta_id; |
| 742 | |
| 743 | $data = compact( 'meta_key', 'meta_value' ); |
| 744 | $where = compact( 'meta_id' ); |
| 745 | |
| 746 | do_action( 'update_postmeta', $meta_id, $post_id, $meta_key, $meta_value ); |
| 747 | $rval = $wpdb->update( $wpdb->postmeta, $data, $where ); |
| 748 | wp_cache_delete($post_id, 'post_meta'); |
| 749 | do_action( 'updated_postmeta', $meta_id, $post_id, $meta_key, $meta_value ); |
| 750 | |
| 751 | return $rval; |
| 752 | } |
| 753 | |
| 754 | // |
| 755 | // Private |
| 756 | // |
| 757 | |
| 758 | /** |