only_subclass     842 Zend/zend_builtin_functions.c static void is_a_impl(INTERNAL_FUNCTION_PARAMETERS, zend_bool only_subclass)
only_subclass     849 Zend/zend_builtin_functions.c 	zend_bool allow_string = only_subclass;
only_subclass     877 Zend/zend_builtin_functions.c 		if (only_subclass && instance_ce == *ce) {