diff --git a/php/src/file.php b/php/src/file.php
index 6bd1928..a8175d4 100644
--- a/php/src/file.php
+++ b/php/src/file.php
@@ -117,4 +117,18 @@ class file {
     }
     return $file;
   }
+
+  static function string_reader(string $content, ?callable $func=null): MemoryStream {
+    $file = new MemoryStream();
+    $file->fwrite($content);
+    $file->rewind();
+    if ($func !== null) {
+      try {
+        $func($file);
+      } finally {
+        $file ->close();
+      }
+    }
+    return $file;
+  }
 }