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php防止sql注入简单分析

Jun 06, 2016 pm 08:06 PM
php sql injection prevent

这篇文章主要介绍了php防止sql注入的方法,简单分析了通过stripslashes及mysql_real_escape_string函数进行字符转移处理的技巧,非常具有实用价值,需要的朋友可以

本文实例分析了php防止sql注入简单方法。分享给大家供大家参考。具体如下:

这里只说一个简单的方法

防止Sql注入的方法有很多,这里要说的其实就是漏洞演练平台Dvwa里的一种方式

直接看high级别的就可以了

$id = $_GET['id']; $id = stripslashes($id); $id = mysql_real_escape_string($id); if (is_numeric($id)){ $getid = "SELECT first_name,last_name FROM users WHERE user_id='$id'"; $result = mysql_query($getid) or die('

'.mysql_error().'
Copy after login
'); $num = mysql_numrows($result);

可见它的处理方式是首先通过 stripslashes 函数删除变量中的反斜杠 \,
然后再使用函数mysql_real_escape_string 转义特殊字符就行了。
所以当我们编写类似代码的时候

$getid="SELECT first_name,last_name FROM users WHERE user_id='$id'";

我们最简单的方法是

直接将变量$id 进行stripslashes 和 mysql_real_escape_string 处理。

注意: 这里并不是说这样就安全了,, 这只是其中一种方式我可没说这就安全了。 更多的还要依据实际情况进行处理。

希望本文所述对大家的php程序设计有所帮助。

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