下面这一小段“劣质”的PHP代码是一道简化了的测试题。这种问题就像在问:你该怎样优化这段代码?
echo(”
Search results for query: ” .
$_GET['query'] . “.
?>
这段代码的主要问题在于它把用户提交的数据直接显示到了网页上,从而产生XSS漏洞。其实有很多方法可以填补这个漏洞。那么,什么代码是我们想要的呢?
echo(”
Search results for query: ” .
htmlspecialchars($_GET['query']) . “.
?>
这是最低要求。XSS漏洞用htmlspecialchars函数填补了,从而屏蔽了非法字符。
if (isset($_GET['query']))
{
echo ‘
Search results for query: ‘,
htmlspecialchars($_GET['query'], ENT_QUOTES), ‘.
}
?>
能写出这样代码的人应该是我想要录用的人了。
可惜的是,能给出这样让人满意答复的程序员少之又少
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