Home > php教程 > php手册 > body text

php 最简单sql防注入函数与方法

WBOY
Release: 2016-05-25 16:41:05
Original
907 people have browsed it

mysql_real_escape_string — 转义 SQL 语句中使用的字符串中的特殊字符,并考虑到连接的当前字符集.

但是注意:该函数并不转义 % 和 _,另外,最好不要对整条sql语句使用该函数,而是只转义传入sql语句的字符串参数,否则会发生意想不到的结果.

<?php  
$item = "Zak&#39;s and Derick&#39;s Laptop";  
$escaped_item = mysql_real_escape_string($item);  
printf ("Escaped string: %sn", $escaped_item);  
?>
Copy after login

addslashes() 函数在指定的预定义字符前添加反斜杠.

这些预定义字符是:

单引号 (') 双引号 (") 反斜杠 () NULL

默认情况下,PHP 指令 magic_quotes_gpc 为 on,对所有的 GET、POST 和 COOKIE 数据自动运行 addslashes(),不要对已经被 magic_quotes_gpc 转义过的字符串使用 addslashes(),因为这样会导致双层转义,遇到这种情况时可以使用函数 get_magic_quotes_gpc() 进行检测.

$str="jane & &#039;tarzan&#039;"; //定义html字符串 
echo html_entity_decode($str); //输出转换后的内容 
echo "<br/>"; 
echo html_entity_decode($str,ent_quotes); //有可选参数输出的内容
Copy after login

   


永久地址:

转载随意~请带上教程地址吧^^

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!