ZEND_FETCH_DIM_IS 1717 Zend/zend_vm_def.h ZEND_VM_HANDLER(90, ZEND_FETCH_DIM_IS, CONST|TMPVAR|CV, CONST|TMPVAR|CV)
ZEND_FETCH_DIM_IS  330 ext/opcache/Optimizer/zend_optimizer.c 		case ZEND_FETCH_DIM_IS: