ZEND_UNSET_VAR   6115 Zend/zend_compile.c 		opline->opcode = ZEND_UNSET_VAR;
ZEND_UNSET_VAR   6125 Zend/zend_compile.c 				last_op->opcode = ZEND_UNSET_VAR;
ZEND_UNSET_VAR   3867 Zend/zend_vm_def.h ZEND_VM_HANDLER(74, ZEND_UNSET_VAR, CONST|TMP|VAR|CV, UNUSED|CONST|VAR)
ZEND_UNSET_VAR    175 ext/opcache/Optimizer/zend_optimizer.c 			case ZEND_UNSET_VAR: