SQL injection character detection function_PHP tutorial-PHP Tutorial-php.cn

SQL injection character detection function_PHP tutorial

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Release： 2016-07-13 17:10:11

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I wrote a sql injection detection function that can effectively detect user posts and filter the obtained references. Friends in need can refer to it.

The code is as follows

代码如下

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/*sql 注入字符的检测
* 在所有用户输入的数据，post传参， get传参都需要检测下
* 如果有匹配到关键字则返回该关键字否则返回false
* 这个和敏感字符的检测不是一样的
*/
function Filter_SQL($strData)
{
$strFilter=$blnFlag=$arrayFilter='';

$strFilter="'|and|(|)|exec|insert|select|delete|update|count|*|%27|chr|mid|master|truncate|char|declare|union|or"; //需要过滤的字符，可以自己添，"|"是分隔符
$blnFlag=false; //过滤标志，如果产生过滤，那么就是真

$arr=explode("|",$strFilter);
$str="";

foreach($arr as $row)
{
$str.=preg_quote($row)."|";
}

$str=trim($str,"|");

if(preg_match('/'.$str.'/i',$strData,$word))
{
return $word[0];
}

return false;
}

/*
测试
$string="fasdf union ";
echo Filter_SQL($string);
*/

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/*SQL injection character detection
* All user-entered data, post parameters, and get parameters need to be detected
* If a keyword is matched, return the keyword, otherwise return false
* This is not the same as the detection of sensitive characters
*/
function Filter_SQL($strData)
{
$strFilter=$blnFlag=$arrayFilter='';

$strFilter="'|and|(|)|exec|insert|select|delete|update|count|*|%27|chr|mid|master|truncate|char|declare|union|or"; / /You can add the characters that need to be filtered by yourself, "|" is the separator
$blnFlag=false; //Filter flag, if filtering occurs, then it is true

$arr=explode("|",$strFilter);
$str="";

foreach($arr as $row)
{
$str.=preg_quote($row)."|";
}

$str=trim($str,"|");

if(preg_match('/'.$str.'/i',$strData,$word))
{
return $word[0];
}

return false;
}