Fix called scope assignment in autoloader

We should use the scope specified in the spl_autoload_register()
call, not whatever LSB scope just so happens to be active at the
time of the autoloader call.

Author: nikic

ext/spl/php_spl.c

@@ -403,7 +403,6 @@ static zend_class_entry *spl_perform_autoload(zend_string *class_name, zend_stri
 	zval params[1];
 	zval retval;
 	zend_string *func_name;
-	zend_class_entry *called_scope = zend_get_called_scope(EG(current_execute_data));
 
 	fci.size = sizeof(fci);
 	fci.retval = &retval;
@@ -431,13 +430,7 @@ static zend_class_entry *spl_perform_autoload(zend_string *class_name, zend_stri
 		if (Z_ISUNDEF(alfi->obj)) {
 			fci.object = NULL;
 			fcic.object = NULL;
-			if (alfi->ce &&
-				(!called_scope ||
-				 !instanceof_function(called_scope, alfi->ce))) {
-				fcic.called_scope = alfi->ce;
-			} else {
-				fcic.called_scope = called_scope;
-			}
+			fcic.called_scope = alfi->ce;
 		} else {
 			fci.object = Z_OBJ(alfi->obj);
 			fcic.object = Z_OBJ(alfi->obj);

ext/spl/tests/spl_autoload_called_scope.phpt

@@ -0,0 +1,33 @@
+--TEST--
+SPL autoloader should not do anything magic with called scope
+--FILE--
+<?php
+
+class Test {
+    public static function register() {
+        spl_autoload_register([Test::class, 'autoload']);
+    }
+
+    public static function autoload($class) {
+        echo "self=" . self::class, ", static=", static::class, "\n";
+    }
+}
+
+class Test2 extends Test {
+    public static function register() {
+        spl_autoload_register([Test2::class, 'autoload']);
+    }
+
+    public static function runTest() {
+        class_exists('FooBar');
+    }
+}
+
+Test::register();
+Test2::register();
+Test2::runTest();
+
+?>
+--EXPECT--
+self=Test, static=Test
+self=Test, static=Test2