ZEND_DEFINED     2960 Zend/zend_compile.c 	opline = zend_emit_op_tmp(result, ZEND_DEFINED, NULL, NULL);
ZEND_DEFINED     7778 Zend/zend_vm_def.h ZEND_VM_HANDLER(122, ZEND_DEFINED, CONST, ANY)
ZEND_DEFINED      176 ext/opcache/Optimizer/compact_literals.c 				case ZEND_DEFINED:
ZEND_DEFINED      601 ext/opcache/Optimizer/pass1_5.c 		case ZEND_DEFINED:
ZEND_DEFINED      171 ext/opcache/Optimizer/zend_optimizer.c 		case ZEND_DEFINED: