XGCTF Ezzz_php 题目 <?php highlight_file(__FILE__); error_reporting(0); function substrstr($data) { $start = mb_strpos($data, "["); $end = mb_strpos($data, "]"); return mb_substr($data, $start + 1, $end - 1 - $start); } class read_file{ public $start; public $...