static::class is only since 5.5 :(

src/DirectoryFilter.php

@@ -55,6 +55,6 @@ class DirectoryFilter extends DirectoryWrapper {
 				'filter' => $filter
 			)
 		);
-		return self::wrapWithOptions($options);
+		return self::wrapWithOptions($options, '\Icewind\Streams\DirectoryFilter');
 	}
 }

src/DirectoryWrapper.php

@@ -75,11 +75,12 @@ class DirectoryWrapper implements Directory {
 
 	/**
 	 * @param string $options the options for the context to wrap the stream with
+	 * @param string $class
 	 * @return resource
 	 */
-	protected static function wrapWithOptions($options) {
+	protected static function wrapWithOptions($options, $class) {
 		$context = stream_context_create($options);
-		stream_wrapper_register('dirwrapper', static::class);
+		stream_wrapper_register('dirwrapper', $class);
 		$wrapped = opendir('dirwrapper://', $context);
 		stream_wrapper_unregister('dirwrapper');
 		return $wrapped;

tests/DirectoryWrapper.php

@@ -7,13 +7,23 @@
 
 namespace Icewind\Streams\Tests;
 
+class DirectoryWrapperNull extends \Icewind\Streams\DirectoryWrapper {
+	public static function wrap($source) {
+		$options = array(
+			'dir' => array(
+				'source' => $source)
+		);
+		return self::wrapWithOptions($options, '\Icewind\Streams\Tests\DirectoryWrapperNull');
+	}
+}
+
 class DirectoryWrapperDummy extends \Icewind\Streams\DirectoryWrapper {
 	public static function wrap($source) {
 		$options = array(
 			'dir' => array(
 				'source' => $source)
 		);
-		return self::wrapWithOptions($options);
+		return self::wrapWithOptions($options, '\Icewind\Streams\Tests\DirectoryWrapperDummy');
 	}
 
 	public function dir_readdir() {
@@ -33,7 +43,7 @@ class DirectoryWrapper extends IteratorDirectory {
 	 */
 	protected function wrapSource($source) {
 		$dir = \Icewind\Streams\IteratorDirectory::wrap($source);
-		return \Icewind\Streams\DirectoryWrapper::wrap($dir);
+		return DirectoryWrapperNull::wrap($dir);
 	}
 
 	public function testManipulateContent() {