Updates php/challenge-97.md

CHYbeta · CHYbeta · commit 4d6b614e07f7 · 2018-11-14T19:37:35.000+08:00
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diff --git a/php/challenge-97.md b/php/challenge-97.md
@@ -1,4 +1,5 @@
 # Challenge 
+index.php:
 ```php
 <?php
 
