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<?php var_dump( preg_replace('/[^A-Za-z0-9_\.\(\)]+/', '', trim('( if( refund.tr_refund_date IS NULL, 1, 0 ) ) DESC, refund.tr_refund_date')) );
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.1
string(60) "(if(refund.tr_refund_dateISNULL10))DESCrefund.tr_refund_date"