- Add macros to mark functions/alias functions as deprecated

(mentioned by Sara and obviously neccessary)
- Fix function/method flag error detection logic

Zend/zend_API.c

@@ -2060,7 +2060,9 @@ ZEND_API int zend_register_functions(zend_class_entry *scope, zend_function_entr
 		}
 		if (ptr->flags) {
 			if (!(ptr->flags & ZEND_ACC_PPP_MASK)) {
-				zend_error(error_type, "Invalid access level for %s%s%s() - access must be exactly one of public, protected or private", scope ? scope->name.s : "", scope ? "::" : "", ptr->fname);
+				if (ptr->flags != ZEND_ACC_DEPRECATED || scope) {
+					zend_error(error_type, "Invalid access level for %s%s%s() - access must be exactly one of public, protected or private", scope ? scope->name.s : "", scope ? "::" : "", ptr->fname);
+				}
 				internal_function->fn_flags = ZEND_ACC_PUBLIC | ptr->flags;
 			} else {
 				internal_function->fn_flags = ptr->flags;

Zend/zend_API.h

@@ -50,7 +50,9 @@ typedef struct _zend_function_entry {
 
 #define ZEND_NAMED_FE(zend_name, name, arg_info)	ZEND_FENTRY(zend_name, name, arg_info, 0)
 #define ZEND_FE(name, arg_info)						ZEND_FENTRY(name, ZEND_FN(name), arg_info, 0)
+#define ZEND_DEP_FE(name, arg_info)                 ZEND_FENTRY(name, ZEND_FN(name), arg_info, ZEND_ACC_DEPRECATED)
 #define ZEND_FALIAS(name, alias, arg_info)			ZEND_FENTRY(name, ZEND_FN(alias), arg_info, 0)
+#define ZEND_DEP_FALIAS(name, alias, arg_info)		ZEND_FENTRY(name, ZEND_FN(alias), arg_info, ZEND_ACC_DEPRECATED)
 #define ZEND_ME(classname, name, arg_info, flags)	ZEND_FENTRY(name, ZEND_FN(classname##_##name), arg_info, flags)
 #define ZEND_ABSTRACT_ME(classname, name, arg_info)	ZEND_FENTRY(name, NULL, arg_info, ZEND_ACC_PUBLIC|ZEND_ACC_ABSTRACT)
 #define ZEND_MALIAS(classname, name, alias, arg_info, flags) \