write_log

function qw( $data ) {
    if ( true === WP_DEBUG ) {

		$backtrace = debug_backtrace();

		$backtrace = array_shift( $backtrace );

		$output['backtrace'] = $backtrace['file'] . ':' . $backtrace['line'];
		$output['data'] = $data;
		error_log( print_r( $output, true ) );
    }
}