http://www.wechall.net/challenge/space/php0819/index.php
这道题要求构造字符串，不能使用引号和其他一些符号
php里可以用heredoc构造字符串，不需要引号。注意结束delimiter后面需要newline，所以eval=%3c%3c%3cA%0a1337%0aA%3b%0a
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