diff --git a/bin/functionMetadata_original.php b/bin/functionMetadata_original.php
index 8f4eb456e53..82c316f0558 100644
--- a/bin/functionMetadata_original.php
+++ b/bin/functionMetadata_original.php
@@ -257,7 +257,7 @@
 	'ob_get_clean' => ['hasSideEffects' => true],
 	'ob_get_contents' => ['hasSideEffects' => true],
 	'ob_get_length' => ['hasSideEffects' => true],
-	'ob_get_level' => ['hasSideEffects' => true],
+	'ob_get_level' => ['hasSideEffects' => false],
 	'ob_get_status' => ['hasSideEffects' => true],
 	'ob_list_handlers' => ['hasSideEffects' => true],
 	'output_add_rewrite_var' => ['hasSideEffects' => true],
diff --git a/bin/generate-function-metadata.php b/bin/generate-function-metadata.php
index f5ef1c5101c..0018406d1c6 100755
--- a/bin/generate-function-metadata.php
+++ b/bin/generate-function-metadata.php
@@ -18,7 +18,7 @@
 
 	$parser = (new ParserFactory())->createForNewestSupportedVersion();
 	$finder = new Finder();
-	$finder->in(__DIR__ . '/../vendor/jetbrains/phpstorm-stubs')->files()->name('*.php');
+	$finder->in(__DIR__ . '/../vendor/jetbrains/phpstorm-stubs')->exclude('tests')->files()->name('*.php');
 
 	$visitor = new class() extends NodeVisitorAbstract {
 
@@ -69,6 +69,7 @@ public function enterNode(Node $node)
 							'function_exists',
 							'json_last_error',
 							'json_last_error_msg',
+							'ob_get_level',
 						], true)) {
 							$this->functions[] = $functionName;
 							break 2;
@@ -91,6 +92,10 @@ public function enterNode(Node $node)
 				if (!$class instanceof Node\Stmt\ClassLike) {
 					throw new ShouldNotHappenException($node->name->toString());
 				}
+				if (!isset($class->namespacedName)) {
+					// anonymous class
+					return null;
+				}
 				$className = $class->namespacedName->toString();
 				foreach ($node->attrGroups as $attrGroup) {
 					foreach ($attrGroup->attrs as $attr) {
@@ -229,5 +234,5 @@ public function enterNode(Node $node)
 		);
 	}
 
-	FileWriter::write(__DIR__ . '/../resources/functionMetadata.php', sprintf($template, $content));
+	FileWriter::write(__DIR__ . '/../resources/functionMetadata.php', sprintf($template, $content) . "\n");
 })();
diff --git a/resources/functionMetadata.php b/resources/functionMetadata.php
index af546d10642..addae7ff100 100644
--- a/resources/functionMetadata.php
+++ b/resources/functionMetadata.php
@@ -676,10 +676,6 @@
 	'Spoofchecker::__construct' => ['hasSideEffects' => false],
 	'StringBackedEnum::from' => ['hasSideEffects' => false],
 	'StringBackedEnum::tryFrom' => ['hasSideEffects' => false],
-	'StubTests\\CodeStyle\\BracesOneLineFixer::getDefinition' => ['hasSideEffects' => false],
-	'StubTests\\Parsers\\ExpectedFunctionArgumentsInfo::__toString' => ['hasSideEffects' => false],
-	'StubTests\\StubsMetaExpectedArgumentsTest::getClassMemberFqn' => ['hasSideEffects' => false],
-	'StubTests\\StubsParameterNamesTest::printParameters' => ['hasSideEffects' => false],
 	'Transliterator::createInverse' => ['hasSideEffects' => false],
 	'Transliterator::getErrorCode' => ['hasSideEffects' => false],
 	'Transliterator::getErrorMessage' => ['hasSideEffects' => false],