wpdb::close(): bool

Source

 *
 * @return bool True if the connection was successfully closed,
 *              false if it wasn't, or if the connection doesn't exist.
 */
public function close() {
	if ( ! $this->dbh ) {
		return false;
	}

	$closed = mysqli_close( $this->dbh );

	if ( $closed ) {
		$this->dbh           = null;
		$this->ready         = false;
		$this->has_connected = false;

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