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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 |
|---|---|
| 137 | |
| 138 | $data = compact( 'meta_value' ); |
| 139 | $where = array( $column => $object_id, 'meta_key' => $meta_key ); |
| 140 | |
| 141 | if ( !empty( $prev_value ) ) { |
| 142 | $prev_value = maybe_serialize($prev_value); |
| 143 | $where['meta_value'] = $prev_value; |
| 144 | } |
| 145 | |
| 146 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 147 | |
| 148 | $wpdb->update( $table, $data, $where ); |
| 149 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 150 | // users cache stores usermeta that must be cleared. |
| 151 | if ( 'user' == $meta_type ) |
| 152 | clean_user_cache($object_id); |
| 153 | |
| 154 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 155 | |