ZEND_SEND_BY_REF  830 Zend/zend_compile.h 	CHECK_ARG_SEND_TYPE(zf, arg_num, ZEND_SEND_BY_REF, ZEND_ACC_PASS_REST_BY_REFERENCE)
ZEND_SEND_BY_REF  833 Zend/zend_compile.h 	CHECK_ARG_SEND_TYPE(zf, arg_num, ZEND_SEND_BY_REF|ZEND_SEND_PREFER_REF, ZEND_ACC_PASS_REST_BY_REFERENCE|ZEND_ACC_PASS_REST_PREFER_REF)
ZEND_SEND_BY_REF 2514 ext/reflection/php_reflection.c 	RETVAL_BOOL(param->arg_info->pass_by_reference != ZEND_SEND_BY_REF);