Updates php/challenge-49.md

CHYbeta · CHYbeta · commit 71fbf712520e · 2017-09-26T16:21:55.000+08:00
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diff --git a/php/challenge-49.md b/php/challenge-49.md
@@ -36,4 +36,4 @@ else {
 ```
 
 # Refference
-+ [实验吧题目](http://blog.csdn.net/qq_35078631/article/details/70941204)
++ [实验吧题目: 让我进去](http://ctf5.shiyanbar.com/web/kzhan.php)
