Fix fatal error when autoloader open directories

Author: staabm

src/Reflection/BetterReflection/SourceLocator/FileReadTrapStreamWrapper.php

@@ -3,6 +3,7 @@
 namespace PHPStan\Reflection\BetterReflection\SourceLocator;
 
 use PHPStan\ShouldNotHappenException;
+use function is_dir;
 use function is_file;
 use function stat;
 use function stream_resolve_include_path;
@@ -259,4 +260,14 @@ public function stream_set_option($option, $arg1, $arg2): bool
 		return false;
 	}
 
+	public function dir_opendir(string $path, int $options): bool
+	{
+		return is_dir($path);
+	}
+
+	public function dir_readdir(): string
+	{
+		return '';
+	}
+
 }