test: keep context in filtered streams

Author: qkdreyer

ext/standard/tests/streams/gh15155.phpt

@@ -0,0 +1,42 @@
+--TEST--
+GH-15155: Stream context is lost when custom stream wrapper is being filtered
+--FILE--
+<?php
+
+class DummyWrapper
+{
+    public $context;
+    
+    public static function register(): void
+    {
+        \stream_wrapper_register('dummy', self::class);
+    }
+    
+    public function stream_open(string $path, string $mode, int $options, ?string &$opened_path): bool
+    {
+        $options = \stream_context_get_options($this->context);
+        var_dump($options['dummy']['foo']);
+        
+        return true;
+    }
+    
+    public function stream_stat()
+    {
+    }
+    
+    public function stream_read()
+    {
+    }
+    
+    public function stream_eof()
+    {
+    }
+}
+
+DummyWrapper::register();
+\file_get_contents('dummy://foo', false, \stream_context_create(['dummy' => ['foo' => 'bar']]));
+\file_get_contents('php://filter/resource=dummy://foo', false, \stream_context_create(['dummy' => ['foo' => 'bar']]));
+?>
+--EXPECT--
+string(288) "bar"
+string(288) "bar"