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php 最简单sql防注入函数与方法

May 25, 2016 pm 04:41 PM
phpphp functionSQL injection prevention

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);  
?>

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

   


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