php xss 攻击防范代码

 <?php
if (isset($_POST['name'])){
    $str = trim($_POST['name']);  //清理空格
    $str = strip_tags($str);   //过滤html标签
    $str = htmlspecialchars($str);   //将字符内容转化为html实体
    $str = addslashes($str);
    echo $str;
}
?>
<form method="post" action="">
<input name="name" type="text">
<input type="submit" value="提交" >
</form>

/**
 * 对 htmlspecialchars 函数的封装
 * @param $item
 * @param string $encoding
 * @return array|mixed|string
 */
function clear_xss($item, $encoding='UTF-8') {
    if (is_array($item)) {
        return array_map('clear_xss', $item);
    } else {
        $item = htmlspecialchars($item, ENT_QUOTES, $encoding);

        //www.111cn.net下面是从CI里拿过来的
        $no   = '/%0[0-8bcef]/';
        $item = preg_replace($no, '', $item);
        $no   = '/%1[0-9a-f]/';
        $item = preg_replace($no, '', $item);
        $no   = '/[- -]+/S';
        $item = preg_replace($no, '', $item);
        return $item;
    }
}

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 <javascript> 
   // note that you have to handle splits with , , and later since they *are* allowed in some inputs 
   $val = preg_replace('/([-][ - ][- ])/', '', $val); 

   // straight replacements, the user should never need these since they're normal characters 
   // this prevents like <IMG SRC=&#X40&#X61&#X76&#X61&#X73&#X63&#X72&#X69&#X70&#X74&#X3A&#X61&#X6C&#X65&#X72&#X74&#X28&#X27&#X58&#X53&#X53&#X27&#X29> 
   $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 

      // &#x0040 @ search for the hex values 
      $val = preg_replace('/(&#[x|X]0{0,8}'.dechex(ord($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 www.111Cn.net remaining whitespace attacks are , , and  
   $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 .= '(&#[x|X]0{0,8}([9][a][b]);?)?'; 
               $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; 
         } 
      } 
   } 
}

<User home>.WebIdeXXconfig 存放用户指定的设置。
<User home>.WebIdeXXsystem 存放PHPStorm 缓存文件。
<User home> 在 WindowsXP 是指 C:Documents and Settings<User name>; 在Windows 7 以上是指 C:Users<User name>

function xss_clean($data){
 // Fix &entity＼n;
 $data=str_replace(array('&amp;','&lt;','&gt;'),array('&amp;amp;','&amp;lt;','&amp;gt;'),$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);
 // http://www.111cn.net/
 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;
}

<?php
 $cs = $_SESSION['cs'] = $_SESSION['cs']+1;//每访问一次加1
 $sql = "INSERT INTO ".$DB_PREFIX."user (username,password,nickname,role,photo,email,description) VALUES ('$username','$password','$user_namex','writer','','$name_mailbox','')";
 if($cs < "2"){//页面被反复刷新的时候 不执行代码
 if( mysql_query($sql) == 1){?>
 <script language="javascript" type="text/javascript"> 
location.href='cache.php';
</script>
 <?php }}else{echo "警告别恶意注册!"; } ?>

    $(document).ready(function(){ 
    //十六进制公钥 
    var rsa_n = "C34E069415AC02FC4EA5F45779B7568506713E9210789D527BB89EE462662A1D0E94285E1A764F111D553ADD7C65673161E69298A8BE2212DF8016787E2F4859CD599516880D79EE5130FC5F8B7F69476938557CD3B8A79A612F1DDACCADAA5B6953ECC4716091E7C5E9F045B28004D33548EC89ED5C6B2C64D6C3697C5B9DD3"; 
         
    $("#submit").click(function(){ 
        setMaxDigits(131); //131 => n的十六进制位数/2+3 
        var key      = new RSAKeyPair("10001", '', rsa_n); //10001 => e的十六进制 
        var password = $("#password").val(); 
        password = encryptedString(key, password); //不支持汉字 
        $("#password").val(password); 
        $("#login").submit(); 
        alert(password); //test 
    }); 
    }); 

    /**
     * 公钥加密
     * www.111Cn.net
     * @param string 明文
     * @param string 证书文件（.crt）
     * @return string 密文（base64编码）
     */ 
    function publickey_encodeing($sourcestr, $fileName) 
    { 
        $key_content = file_get_contents($fileName); 
        $pubkeyid    = openssl_get_publickey($key_content); 
         
        if (openssl_public_encrypt($sourcestr, $crypttext, $pubkeyid)) 
        { 
            return base64_encode("".$crypttext); 
        } 
    } 
    /**
     * 私钥解密
     *
     * @param string 密文（二进制格式且base64编码）
     * @param string 密钥文件（.pem / .key）
     * @param string 密文是否来源于JS的RSA加密
     * @return string 明文
     */ 
    function privatekey_decodeing($crypttext, $fileName, $fromjs = FALSE) 
    { 
        $key_content = file_get_contents($fileName); 
        $prikeyid    = openssl_get_privatekey($key_content); 
        $crypttext   = base64_decode($crypttext); 
        $padding = $fromjs ? OPENSSL_NO_PADDING : OPENSSL_PKCS1_PADDING; 
        if (openssl_private_decrypt($crypttext, $sourcestr, $prikeyid, $padding)) 
        { 
            return $fromjs ? rtrim(strrev($sourcestr), "/0") : "".$sourcestr; 
        } 
        return ; 
    } 
    //JS->PHP 测试 
    $txt_en = $_POST['password']; 
    $txt_en = base64_encode(pack("H*", $txt_en)); 
    $file = 'ssl/server.pem'; 
    $txt_de = privatekey_decodeing($txt_en, $file, TRUE); 
    var_dump($txt_de); 
    //PHP->PHP 测试  www.111cn.net
    $data = "汉字:1a2b3c"; 
    $config = Core::getInstance()->config; 
    $file1 = 'ssl/server.crt'; 
    $file2 = 'ssl/server.pem'; 
    $a = publickey_encodeing($data, $file1); 
    $b = privatekey_decodeing($a, $file2); 
    var_dump($b);