Updates php/challenge-98.md

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Author: CHYbeta

SUMMARY.md

@@ -101,6 +101,7 @@
 * [Challenge 95](php/challenge-95.md)
 * [Challenge 96](php/challenge-96.md)
 * [Challenge 97](php/challenge-97.md)
+* [Challenge 98](php/challenge-98.md)
 
 ## RUBY
 

php/challenge-98.md

@@ -0,0 +1,19 @@
+# Challlenge 
+```php
+<?php
+highlight_file(__FILE__);
+$b = 'implode';
+call_user_func($_GET[f],$_POST);
+session_start();
+if(isset($_GET[name])){
+    $_SESSION[name] = $_GET[name];
+}
+var_dump($_SESSION);
+$a = array(reset($_SESSION),'welcome_to_the_lctf2018');
+call_user_func($b,$a);
+?>
+
+```
+
+# Refference
++ LCTF 2018