ZEND_PARAM_REF   1559 Zend/zend_ast.c 			if (ast->attr & ZEND_PARAM_REF) {
ZEND_PARAM_REF   4454 Zend/zend_compile.c 		zend_bool is_ref = (param_ast->attr & ZEND_PARAM_REF) != 0;
ZEND_PARAM_REF    484 Zend/zend_language_parser.y 	|	'&'			{ $$ = ZEND_PARAM_REF; }