interface_exists 52 Zend/zend_builtin_functions.c static ZEND_FUNCTION(interface_exists); interface_exists 263 Zend/zend_builtin_functions.c ZEND_FE(interface_exists, arginfo_class_exists) interface_exists 1272 Zend/zend_builtin_functions.c ZEND_FUNCTION(interface_exists)