php如何预防sql注入漏洞 SQL注入漏洞的危害
php预防sql注入漏洞的方法:
利用magic_quotes_gpc指令或它的搭挡addslashes()函数进行过滤,例如:
<?php//php防注入和XSS攻击通用过滤
$_GET && SafeFilter($_GET);
$_POST && SafeFilter($_POST);
$_COOKIE && SafeFilter($_COOKIE);
function SafeFilter (&$arr)
{
$ra=Array('/([x00-x08,x0b-x0c,x0e-x19])/','/script/','/javascript/','/vbscript/','/expression/','/applet/'
,'/meta/','/xml/','/blink/','/link/','/style/','/embed/','/object/','/frame/','/layer/','/title/','/bgsound/'
,'/base/','/onload/','/onunload/','/onchange/','/onsubmit/','/onreset/','/onselect/','/onblur/','/onfocus/',
'/onabort/','/onkeydown/','/onkeypress/','/onkeyup/','/onclick/','/ondblclick/','/onmousedown/','/onmousemove/'
,'/onmouseout/','/onmouseover/','/onmouseup/','/onunload/');
if (is_array($arr))
{
foreach ($arr as $key => $value)
{
if (!is_array($value))
{
if (!get_magic_quotes_gpc()) //不对magic_quotes_gpc转义过的字符使用addslashes(),避免双重转义。
{
$value = addslashes($value); //给单引号(')、双引号(")、反斜线()与 NUL(NULL 字符)
加上反斜线转义
}
$value = preg_replace($ra,'',$value); //删除非打印字符,粗暴式过滤xss可疑字符串
$arr[$key] = htmlentities(strip_tags($value)); //去除HTML和PHP标记并转换为HTML实体
}
else
{
SafeFilter($arr[$key]);
}
}
}
}
?>
发布于:2022-12-21,除非注明,否则均为
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