过滤xss攻击和sql注入函数

/**
+----------------------------------------------------------
* The goal of this function is to be a generic function that can be used to parse almost any input and     * render it XSS safe. For more information on actual XSS attacks, check out http://ha.ckers.org/xss.html. * Another excellent site is the XSS Database which details each attack and how it works.
* XSS过滤
+----------------------------------------------------------
* @param mixed $value 变量
+----------------------------------------------------------
* @return mixed 过滤后的字符串
+----------------------------------------------------------
*/ 
function RemoveXSS($val) { 
    // remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed 
    // this prevents some character re-spacing such as <java\0script> 
    // 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 <IMG SRC=@avascript:alert('XSS')> 
    $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; 
}
/* 
+----------------------------------------------------------   
* 函数名称：inject_check()
+----------------------------------------------------------   
* 函数作用：检测提交的值是不是含有SQL注射的字符，防止注射，保护服务器安全
+----------------------------------------------------------    
* @param mixed $sql_str: 提交的变量
+----------------------------------------------------------
* @return mixed 返回检测结果，ture or false
+----------------------------------------------------------
*/          
function inject_check($sql_str) {       
    return $sql_str = preg_replace('select|insert|update|delete|\'|\/\*|\*|\.\.\/|\.\/|union|into|load_file|outfile','', $sql_str);    // 进行过滤       
}
/* 
+----------------------------------------------------------   
* 函数名称：escapeMysql()
* SQL注入主要是提交不安全的数据给数据库来达到攻击目的。为了防止SQL注入攻击，PHP自带一个功能可以对输入的字符串进行处理，可以在较底层对 * 输入进行安全上的初步处理，也即Magic Quotes。(php.ini magic_quotes_gpc)。如果magic_quotes_gpc选项启用，那么输入的字符串    * 中的单引号，双引号和其它一些字符前将会被自动加上反斜杠\。

* 但Magic Quotes并不是一个很通用的解决方案，没能屏蔽所有有潜在危险的字符，并且在许多服务器上Magic Quotes并没有被启用。所以，我们    * 还需要使用其它多种方法来防止SQL注入。许多数据库本身就提供这种输入数据处理功能。例如PHP的MySQL操作函数中有一个叫                 * mysql_real_escape_string()的函数，可将特殊字符和可能引起数据库操作出错的字符转义。
+----------------------------------------------------------   
* 函数作用：检测提交的值是不是含有SQL注射的字符，防止注射，保护服务器安全
+----------------------------------------------------------    
* @param mixed $sql_str: 提交的变量
+----------------------------------------------------------
* @return mixed 返回检测结果，ture or false
+----------------------------------------------------------
*/     
function escapeMysql($el){
    if(is_array($el))
    {   
        return   array_map("escapeMysql",   $el   );
    }else{
        /*如果Magic Quotes功用启用    */
        if (!get_magic_quotes_gpc()) {
            $el = mysql_real_escape_string(trim($el));
        }
        $el    =    str_ireplace("%5d%5c", "'", $el);
        $el = str_replace("_", "\_", $el);    // 把 '_'过滤掉       
        $el = str_replace("%", "\%", $el);    // 把 '%'过滤掉       
        $el = nl2br($el);    // 回车转换 
        return   $el;    
    }             
}
/**
+----------------------------------------------------------
* 变量过滤
+----------------------------------------------------------
* @param mixed $value 变量
+----------------------------------------------------------
* @return mixed
+----------------------------------------------------------
*/

function var_filter_deep($value) {
    return $value;
    if(is_array($value))
    {   
        return $value =   array_map("var_filter_deep",   $value   );
    }else{
        $value = RemoveXSS($value);
        //$value = inject_check($value);
        $value = escapeMysql($value);
        return $value;
    }    
}

/*
+----------------------------------------------------------    
* 函数名称：verify_id() 
+----------------------------------------------------------   
* 函数作用：校验提交的ID类值是否合法
+----------------------------------------------------------    
* 参　　数：$id: 提交的ID值 
+----------------------------------------------------------   
* 返 回 值：返回处理后的ID
+----------------------------------------------------------    
*/      
function verify_id($id=null) {       
    if (!$id) { exit('没有提交参数！'); }    // 是否为空判断       
        elseif (inject_check($id)) { exit('提交的参数非法！'); }    // 注射判断       
    elseif (!is_numeric($id)) { exit('提交的参数非法！'); }    // 数字判断       
    $id = intval($id);    // 整型化         
    return $id;       
}

/**
+----------------------------------------------------------
* 变量安全过滤
+----------------------------------------------------------
* @static
* @access public
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
function varFilter ()
{
   $_SERVER = array_map(   "var_filter_deep", $_SERVER );
   $_REQUEST = array_map(   "var_filter_deep", $_REQUEST);
   $_POST    = array_map(   "var_filter_deep", $_POST   );   
   $_GET     = array_map(   "var_filter_deep", $_GET    );   
   $_COOKIE = array_map(   "var_filter_deep", $_COOKIE );
   //print_r($_POST);
}