ZEND_IS_EQUAL    4073 Zend/zend_language_parser.c     { zend_do_binary_op(ZEND_IS_EQUAL, &(yyval), &(yyvsp[(1) - (3)]), &(yyvsp[(3) - (3)]) TSRMLS_CC); }
ZEND_IS_EQUAL     596 Zend/zend_language_parser.y 	|	expr T_IS_EQUAL expr			{ zend_do_binary_op(ZEND_IS_EQUAL, &$$, &$1, &$3 TSRMLS_CC); }
ZEND_IS_EQUAL     473 Zend/zend_opcode.c 		case ZEND_IS_EQUAL:
ZEND_IS_EQUAL     158 Zend/zend_vm_def.h ZEND_VM_HANDLER(17, ZEND_IS_EQUAL, CONST|TMP|VAR|CV, CONST|TMP|VAR|CV)