replace防注入的方法


   <?php
    /**
    * 安全过滤函数
    *
    * @param $string
    * @return string
    */
    function safe_replace($string) {
    $string = str_replace('%20','',$string);
    $string = str_replace('%27','',$string);
    $string = str_replace('%2527','',$string);
    $string = str_replace('*','',$string);
    $string = str_replace('"','&quot;',$string);
    $string = str_replace("'",'',$string);
    $string = str_replace('"','',$string);
    $string = str_replace(';','',$string);
    $string = str_replace('<','&lt;',$string);
    $string = str_replace('>','&gt;',$string);
    $string = str_replace("{",'',$string);
    $string = str_replace('}','',$string);
    $string = str_replace('','',$string);
    return $string;
    }
    ?>


    <?php
    /**
    * 返回经addslashes处理过的字符串或数组
    * @param $string 需要处理的字符串或数组
    * @return mixed
    */
    function new_addslashes($string) {
    if(!is_array($string)) return addslashes($string);
    foreach($string as $key => $val) $string[$key] = new_addslashes($val);
    return $string;
    }
    ?>


    <?php
    //对请求的字符串进行安全处理
    /*
    $safestep
    0 为不处理,
    1 为禁止不安全HTML内容(javascript等),
    2 完全禁止HTML内容,并替换部份不安全字符串(如:eval(、union、CONCAT(、--、等)
    */
    function StringSafe($str, $safestep=-1){
    $safestep = ($safestep > -1) ? $safestep : 1;
    if($safestep == 1){
    $str = preg_replace("#script:#i", "script:", $str);
    $str = preg_replace("#<[/]{0,1}(link|meta|ifr|fra|scr)[^>]*>#isU", '', $str);
    $str = preg_replace("#[ ]{1,}#", ' ', $str);
    return $str;
    }else if($safestep == 2){
    $str = addslashes(htmlspecialchars(stripslashes($str)));
    $str = preg_replace("#eval#i", 'eval', $str);
    $str = preg_replace("#union#i", 'union', $str);
    $str = preg_replace("#concat#i", 'concat', $str);
    $str = preg_replace("#--#", '--', $str);
    $str = preg_replace("#[ ]{1,}#", ' ', $str);
    return $str;
    }else{
    return $str;
    }
    }
    ?>


    <?php
       /**
        +----------------------------------------------------------
        * 输出安全的html,用于过滤危险代码
        +----------------------------------------------------------
        * @access public
        +----------------------------------------------------------
        * @param string $text 要处理的字符串
        * @param mixed $tags 允许的标签列表,如 table|td|th|td
        +----------------------------------------------------------
        * @return string
        +----------------------------------------------------------
        */
       static public function safeHtml($text, $tags = null)
       {
           $text =  trim($text);
           //完全过滤注释
           $text = preg_replace('/<!--?.*-->/','',$text);
           //完全过滤动态代码
           $text =  preg_replace('/<?|?'.'>/','',$text);
           //完全过滤js
           $text = preg_replace('/<script?.*/script>/','',$text);
           $text =  str_replace('[','&#091;',$text);
           $text = str_replace(']','&#093;',$text);
           $text =  str_replace('|','&#124;',$text);
           //过滤换行符
           $text = preg_replace('/ ? /','',$text);
           //br
           $text =  preg_replace('/<br(s/)?'.'>/i','[br]',$text);
           $text = preg_replace('/([br]s*){10,}/i','[br]',$text);
           //过滤危险的属性,如:过滤on事件lang js
           while(preg_match('/(<[^><]+)(lang|on|action|background|codebase|dynsrc|lowsrc)[^><]+/i',$text,$mat)){
               $text=str_replace($mat[0],$mat[1],$text);
           }
           while(preg_match('/(<[^><]+)(window.|javascript:|js:|about:|file:|document.|vbs:|cookie)([^><]*)/i',$text,$mat)){
               $text=str_replace($mat[0],$mat[1].$mat[3],$text);
           }
           if( empty($allowTags) ) { $allowTags = self::$htmlTags['allow']; }
           //允许的HTML标签
           $text =  preg_replace('/<('.$allowTags.')( [^><[]]*)>/i','[12]',$text);
           //过滤多余html
           if ( empty($banTag) ) { $banTag = self::$htmlTags['ban']; }
           $text =  preg_replace('/</?('.$banTag.')[^><]*>/i','',$text);
           //过滤合法的html标签
           while(preg_match('/<([a-z]+)[^><[]]*>[^><]*</1>/i',$text,$mat)){
               $text=str_replace($mat[0],str_replace('>',']',str_replace('<','[',$mat[0])),$text);
           }
           //转换引号
           while(preg_match('/([[^[]]*=s*)("|')([^2=[]]+)2([^[]]*])/i',$text,$mat)){
               $text=str_replace($mat[0],$mat[1].'|'.$mat[3].'|'.$mat[4],$text);
           }
           //空属性转换
           $text =  str_replace('''','||',$text);
           $text = str_replace('""','||',$text);
           //过滤错误的单个引号
           while(preg_match('/[[^[]]*("|')[^[]]*]/i',$text,$mat)){
               $text=str_replace($mat[0],str_replace($mat[1],'',$mat[0]),$text);
           }
           //转换其它所有不合法的 < >
           $text =  str_replace('<','&lt;',$text);
           $text = str_replace('>','&gt;',$text);
           $text = str_replace('"','&quot;',$text);
           //反转换
           $text =  str_replace('[','<',$text);
           $text =  str_replace(']','>',$text);
           $text =  str_replace('|','"',$text);
           //过滤多余空格
           $text =  str_replace('  ',' ',$text);
           return $text;
       }
    ?>

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