Fixed bug #76430

It's somewhat ambiguous what exactly the correct behavior is
supposed to be, I'm just picking something more or less reasonable
here.

Author: nikic

NEWS

@@ -5,7 +5,8 @@ PHP                                                                        NEWS
 - Core:
   . Implemented request #76148 (Add array_key_exists() to the list of
     specially compiled functions). (Majkl578)
-  . Fixed bug #77546 (iptcembed broken function). (gdegoulet)
+  . Fixed bug #76430 (__METHOD__ inconsistent outside of method).
+    (Ryan McCullagh, Nikita)
 
 - CURL:
   . Fixed bug #76480 (Use curl_multi_wait() so that timeouts are respected).

Zend/tests/bug76430.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Bug #76430: __METHOD__ inconsistent outside of method
+--FILE--
+<?php
+
+class Foo {
+    const X = __METHOD__;
+}
+function foo() {
+    class Bar {
+        const X = __METHOD__;
+    }
+}
+
+foo();
+var_dump(Foo::X);
+var_dump(Bar::X);
+
+?>
+--EXPECT--
+string(0) ""
+string(0) ""

Zend/tests/nested_method_and_function.phpt

@@ -30,7 +30,7 @@ $c();
 --EXPECT--
 string(7) "Baz\foo"
 string(7) "Baz\foo"
-string(7) "Baz\Foo"
+string(0) ""
 string(3) "bar"
 string(12) "Baz\Foo::bar"
 string(7) "Baz\Foo"

Zend/zend_compile.c

@@ -5784,6 +5784,7 @@ void zend_compile_func_decl(znode *result, zend_ast *ast, zend_bool toplevel) /*
 	zend_ast *return_type_ast = decl->child[3];
 	zend_bool is_method = decl->kind == ZEND_AST_METHOD;
 
+	zend_class_entry *orig_class_entry = CG(active_class_entry);
 	zend_op_array *orig_op_array = CG(active_op_array);
 	zend_op_array *op_array = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
 	zend_oparray_context orig_oparray_context;
@@ -5816,6 +5817,13 @@ void zend_compile_func_decl(znode *result, zend_ast *ast, zend_bool toplevel) /*
 
 	CG(active_op_array) = op_array;
 
+	/* Do not leak the class scope into free standing functions, even if they are dynamically
+	 * defined inside a class method. This is necessary for correct handling of magic constants.
+	 * For example __CLASS__ should always be "" inside a free standing function. */
+	if (decl->kind == ZEND_AST_FUNC_DECL) {
+		CG(active_class_entry) = NULL;
+	}
+
 	if (toplevel) {
 		op_array->fn_flags |= ZEND_ACC_TOP_LEVEL;
 	}
@@ -5863,6 +5871,7 @@ void zend_compile_func_decl(znode *result, zend_ast *ast, zend_bool toplevel) /*
 	zend_stack_del_top(&CG(loop_var_stack));
 
 	CG(active_op_array) = orig_op_array;
+	CG(active_class_entry) = orig_class_entry;
 }
 /* }}} */
 
@@ -6724,17 +6733,20 @@ static zend_bool zend_try_ct_eval_magic_const(zval *zv, zend_ast *ast) /* {{{ */
 			}
 			break;
 		case T_METHOD_C:
-			if ((op_array && !op_array->scope && op_array->function_name) || (op_array->fn_flags & ZEND_ACC_CLOSURE)) {
-				ZVAL_STR_COPY(zv, op_array->function_name);
-			} else if (ce) {
-				if (op_array && op_array->function_name) {
-					ZVAL_NEW_STR(zv, zend_concat3(ZSTR_VAL(ce->name), ZSTR_LEN(ce->name), "::", 2,
+			/* Detect whether we are directly inside a class (e.g. a class constant) and treat
+			 * this as not being inside a function. */
+			if (op_array && ce && !op_array->scope && !(op_array->fn_flags & ZEND_ACC_CLOSURE)) {
+				op_array = NULL;
+			}
+			if (op_array && op_array->function_name) {
+				if (op_array->scope) {
+					ZVAL_NEW_STR(zv, zend_concat3(
+						ZSTR_VAL(op_array->scope->name), ZSTR_LEN(op_array->scope->name),
+						"::", 2,
 						ZSTR_VAL(op_array->function_name), ZSTR_LEN(op_array->function_name)));
 				} else {
-					ZVAL_STR_COPY(zv, ce->name);
+					ZVAL_STR_COPY(zv, op_array->function_name);
 				}
-			} else if (op_array && op_array->function_name) {
-				ZVAL_STR_COPY(zv, op_array->function_name);
 			} else {
 				ZVAL_EMPTY_STRING(zv);
 			}