CI框架的安全性分析_php实例
本文分析了CI框架的安全性。分享给大家供大家参考,具体如下:
用过ci框架的人都知道,ci框架能大大缩短你的代码。其实,ci框架更能提高你网站的安全性。
防止对数据库的攻击
数据输入可能引发许多问题。因为 HTML 和数据库的限制,数据中总包含特定的符号—举例来说,省略符号和引号—可能导致你的数据库遭到攻击,最终得到你无法预料的结果。
解决方案是在把这些数据存入数据库前对这些数据进行相关处理。这样做会浪费一些系统时间,增加一些额外编码。
CI 的表单辅助函数会自动地完成这些工作。因此,当你编写一个输入框时:
echo form_input('username', 'johndoe');
CI 也隐式地执行下列校验函数:
function form_prep($str = '') { if ($str === '') { return ''; } $temp = '__TEMP_AMPERSANDS__'; // Replace entities to temporary markers so that // htmlspecialchars won't mess them up $str = preg_replace("/&#(\d+);/", "$temp\\1;", $str); $str = preg_replace("/&(\w+);/", "$temp\\1;", $str); $str = htmlspecialchars($str); // In case htmlspecialchars misses these. $str = str_replace(array("'", '"'), array("'", """), $str); // Decode the temp markers back to entities $str = preg_replace("/$temp(\d+);/","&#\\1;",$str); $str = preg_replace("/$temp(\w+);/","&\\1;",$str); return $str; }
上述函数捕获像“&”这样的特殊字符,以便在你的页面提交时不会造成混乱。你应该知道,有些字符会引起问题。
并不是所有的用户都会中规中矩的输入符合要求的信息,你也不可能知道使用浏览器输入信息的是什么人,他们在想什么,做什么。你可以使用 CI 来防止输入不符合要求的信息。当然,你大可不必知道 CI 是如何在幕后为你做到这一切的,你只需要简单地输入如下代码:
echo form_input('username', 'johndoe');
更多关于CodeIgniter相关内容感兴趣的读者可查看本站专题:《codeigniter入门教程》、《CI(CodeIgniter)框架进阶教程》、《php优秀开发框架总结》、《ThinkPHP入门教程》、《ThinkPHP常用方法总结》、《Zend FrameWork框架入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家基于CodeIgniter框架的PHP程序设计有所帮助。

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