XSS利用JAVA脚本

我的网站有问题，许多黑客来找我，窃取会员cookie并重定向到他们的网站。我搜索了一下，发现了一个阻止xss利用的脚本，但我是php的新手，不知道如何使用它。我尝试使用include和php文件的名称。此脚本：

/* 
* XSS filter 
* 
* This was built from numerous sources 
* (thanks all, sorry I didn't track to credit you) 
* 
* It was tested against *most* exploits here: http://ha.ckers.org/xss.html 
* WARNING: Some weren't tested!!! 
* Those include the Actionscript and SSI samples, or any newer than Jan 2011 
* 
* 
* TO-DO: compare to SymphonyCMS filter: 
* https://github.com/symphonycms/xssfilter/blob/master/extension.driver.php 
* (Symphony's is probably faster than my hack) 
*/ 
function xss_clean($data) 
{ 
    // Fix &entity'n; 
    $data = str_replace(array('&','<','>'), array('&','<','>'), $data); 
    $data = preg_replace('/(&#*'w+)['x00-'x20]+;/u', '$1;', $data); 
    $data = preg_replace('/(&#x*[0-9A-F]+);*/iu', '$1;', $data); 
    $data = html_entity_decode($data, ENT_COMPAT, 'UTF-8'); 
// Remove any attribute starting with "on" or xmlns 
    $data = preg_replace('#(<[^>]+?['x00-'x20"''])(?:on|xmlns)[^>]*+>#iu', '$1>', $data); 
// Remove javascript: and vbscript: protocols 
    $data = preg_replace('#([a-z]*)['x00-'x20]*=['x00-'x20]*([`''"]*)['x00-'x20]*j['x00-'x20]*a['x00-'x20]*v['x00-'x20]*a['x00-'x20]*s['x00-'x20]*c['x00-'x20]*r['x00-'x20]*i['x00-'x20]*p['x00-'x20]*t['x00-'x20]*:#iu', '$1=$2nojavascript...', $data); 
    $data = preg_replace('#([a-z]*)['x00-'x20]*=([''"]*)['x00-'x20]*v['x00-'x20]*b['x00-'x20]*s['x00-'x20]*c['x00-'x20]*r['x00-'x20]*i['x00-'x20]*p['x00-'x20]*t['x00-'x20]*:#iu', '$1=$2novbscript...', $data); 
    $data = preg_replace('#([a-z]*)['x00-'x20]*=([''"]*)['x00-'x20]*-moz-binding['x00-'x20]*:#u', '$1=$2nomozbinding...', $data); 
// Only works in IE: <span style="width: expression(alert('Ping!'));"></span> 
    $data = preg_replace('#(<[^>]+?)style['x00-'x20]*=['x00-'x20]*[`''"]*.*?expression['x00-'x20]*'([^>]*+>#i', '$1>', $data); 
    $data = preg_replace('#(<[^>]+?)style['x00-'x20]*=['x00-'x20]*[`''"]*.*?behaviour['x00-'x20]*'([^>]*+>#i', '$1>', $data); 
    $data = preg_replace('#(<[^>]+?)style['x00-'x20]*=['x00-'x20]*[`''"]*.*?s['x00-'x20]*c['x00-'x20]*r['x00-'x20]*i['x00-'x20]*p['x00-'x20]*t['x00-'x20]*:*[^>]*+>#iu', '$1>', $data); 
// Remove namespaced elements (we do not need them) 
    $data = preg_replace('#</*'w+:'w[^>]*+>#i', '', $data); 
    do 
    { 
    // Remove really unwanted tags 
        $old_data = $data; 
        $data = preg_replace('#</*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^>]*+>#i', '', $data); 
    } 
    while ($old_data !== $data); 
// we are done... 
return $data; 
}

如何使用它？请解释一下放在哪里？