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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 |
|---|---|
| 109 | $query = "DELETE FROM $table WHERE meta_id IN( " . implode( ',', $meta_ids ) . " )"; |
| 110 | |
| 111 | $count = $wpdb->query($query); |
| 112 | |
| 113 | if ( !$count ) |
| 114 | return false; |
| 115 | |
| 116 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 117 | |
| 118 | do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $meta_value ); |
| 119 | |
| 120 | return true; |
| 121 | } |
| 122 | |
| 123 | function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) { |
| 124 | if ( !$meta_type ) |
| 125 | return false; |
| 126 | |
| 127 | $meta_cache = wp_cache_get($object_id, $meta_type . '_meta'); |