<?php if(isset($_GET['code'])){ $code=$_GET['code']; eval($code); }else{ highlight_file(__FILE__); } ?>

<?php if(isset($_GET['code'])){ $code=$_GET['code']; eval($code); }else{ highlight_file(__FILE__); } ?>
这段代码是一个简单的PHP脚本，它通过GET方法接收名为code的参数，并将该参数作为PHP代码进行执行。如果code参数存在，则执行eval函数来执行用户传入的code参数。如果code参数不存在，则调用highlight_file函数来显示当前文件的源代码。这段代码的作用是允许用户通过GET方法传入代码，并执行该代码。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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