移除XSS攻击脚本

function RemoveXSS($val) {
// remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
// this prevents some character re-spacing such as
// note that you have to handle splits with \n, \r, and \t later since they *are* allowed in some inputs
$val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $val);
// straight replacements, the user should never need these since they're normal characters
// this prevents like
$search = 'abcdefghijklmnopqrstuvwxyz';
$search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$search .= '1234567890!@#$%^&*()';
$search .= '~`";:?+/={}[]-_|\'\\';
for ($i = 0; $i < strlen($search); $i++) {
// ;? matches the ;, which is optional
// 0{0,7} matches any padded zeros, which are optional and go up to 8 chars

        // @ @ search for the hex values  
        $val = preg\_replace('/(&#\[xX\]0{0,8}'.dechex(ord($search\[$i\])).';?)/i', $search\[$i\], $val); // with a ;  
        // @ @ 0{0,7} matches '0' zero to seven times  
        $val = preg\_replace('/(&#0{0,8}'.ord($search\[$i\]).';?)/', $search\[$i\], $val); // with a ;  
    }

    // now the only remaining whitespace attacks are \\t, \\n, and \\r  
    $ra1 = array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');  
    $ra2 = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');  
    $ra = array\_merge($ra1, $ra2);

    $found = true; // keep replacing as long as the previous round replaced something  
    while ($found == true) {  
        $val\_before = $val;  
        for ($i = 0; $i < sizeof($ra); $i++) {  
            $pattern = '/';  
            for ($j = 0; $j < strlen($ra\[$i\]); $j++) {  
                if ($j > 0) {  
                    $pattern .= '(';  
                    $pattern .= '(&#\[xX\]0{0,8}(\[9ab\]);)';  
                    $pattern .= '|';  
                    $pattern .= '|(&#0{0,8}(\[9|10|13\]);)';  
                    $pattern .= ')\*';  
                }  
                $pattern .= $ra\[$i\]\[$j\];  
            }  
            $pattern .= '/i';  
            $replacement = substr($ra\[$i\], 0, 2).'<x>'.substr($ra\[$i\], 2); // add in <> to nerf the tag  
            $val = preg\_replace($pattern, $replacement, $val); // filter out the hex tags  
            if ($val\_before == $val) {  
                // no replacements were made, so exit the loop  
                $found = false;  
            }  
        }  
    }  
    return $val;  
}

GBK转UTF8

function GBKtoUTF8($str)
{
if(is_array($str))
{
foreach ($str as &$value)
{
$value = GBKtoUTF8($value);
}
return $str;
}elseif(is_string($str)){
$str = iconv("GB18030", "UTF-8//IGNORE", $str);
return $str;
}else{
return $str;
}
}

UTF8转GBK

function UTF8toGBK(&$str)
{
if(is_array($str))
{
foreach ($str as &$value)
{
$value = UTF8toGBK($value);
}
return $str;
}elseif (is_string($str)){
$str = iconv("UTF-8", "GB18030//IGNORE", $str);
return $str;
}else{
return $str;
}
}