WordPress at a glance
function is not described

drop_index() WP 1.0.1

Drops a specified index from a table.

  • Global. wpdb. $wpdb

No Hooks.


true. True, when finished.


drop_index( $table, $index );
$table(string) (required)
Database table name.
$index(string) (required)
Index name to drop.

Code of drop index: wp-admin/includes/upgrade.php VER 5.1.1

function drop_index( $table, $index ) {
	global $wpdb;
	$wpdb->query( "ALTER TABLE `$table` DROP INDEX `$index`" );
	// Now we need to take out all the extra ones we may have created
	for ( $i = 0; $i < 25; $i++ ) {
		$wpdb->query( "ALTER TABLE `$table` DROP INDEX `{$index}_$i`" );
	return true;