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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 |
---|---|
797 |
|
798 | $post_id = $wpdb->get_var( $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_id = %d", $meta_id) ); |
799 |
|
800 | $meta_value = maybe_serialize( stripslashes_deep( $meta_value ) ); |
801 | $meta_id = (int) $meta_id; |
802 |
|
803 | $data = compact( 'meta_key', 'meta_value' ); |
804 | $where = compact( 'meta_id' ); |
805 |
|
806 | do_action( 'update_postmeta', $meta_id, $post_id, $meta_key, $meta_value ); |
807 | $rval = $wpdb->update( $wpdb->postmeta, $data, $where ); |
808 | wp_cache_delete($post_id, 'post_meta'); |
809 | do_action( 'updated_postmeta', $meta_id, $post_id, $meta_key, $meta_value ); |
810 |
|
811 | return $rval; |
812 | } |
813 |
|
814 | // |
815 | // Private |