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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 |
|---|---|
| 221 | return false; |
| 222 | |
| 223 | if ( $delete_all ) |
| 224 | $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) ); |
| 225 | |
| 226 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 227 | |
| 228 | // Old-style action. |
| 229 | if ( 'post' == $meta_type ) |
| 230 | do_action( 'delete_postmeta', $meta_ids ); |
| 231 | |
| 232 | $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )"; |
| 233 | |
| 234 | $count = $wpdb->query($query); |
| 235 | |
| 236 | if ( !$count ) |
| 237 | return false; |
| 238 | |
| 239 | if ( $delete_all ) { |