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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 215 | $query .= $wpdb->prepare(" AND meta_value = %s", $meta_value ); |
| 216 | |
| 217 | $meta_ids = $wpdb->get_col( $query ); |
| 218 | if ( !count( $meta_ids ) ) |
| 219 | return false; |
| 220 | |
| 221 | if ( $delete_all ) |
| 222 | $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) ); |
| 223 | |
| 224 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 225 | |
| 226 | // Old-style action. |
| 227 | if ( 'post' == $meta_type ) |
| 228 | do_action( 'delete_postmeta', $meta_ids ); |
| 229 | |
| 230 | $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )"; |
| 231 | |
| 232 | $count = $wpdb->query($query); |
| 233 | |
| Line | Code |
| 479 | |
| 480 | // object and id columns |
| 481 | $column = esc_sql($meta_type . '_id'); |
| 482 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
| 483 | |
| 484 | // Fetch the meta and go on if it's found. |
| 485 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
| 486 | $object_id = $meta->{$column}; |
| 487 | |
| 488 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 489 | |
| 490 | // Old-style action. |
| 491 | if ( 'post' == $meta_type || 'comment' == $meta_type ) |
| 492 | do_action( "delete_{$meta_type}meta", $meta_id ); |
| 493 | |
| 494 | // Run the query, will return true if deleted, false otherwise |
| 495 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 496 | |
| 497 | // Clear the caches. |