php各种过滤字符函数

作者:enenba | 发表于:2013-01-04 12:48 | 分类:php源码

收集的php各种过滤字符函数,从几个cms中提取的。随便拿来用

<?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
/**
 * 转义 javascript 代码标记
 *
 * @param $str
 * @return mixed
 */
 function trim_script($str) {
	if(is_array($str)){
		foreach ($str as $key => $val){
			$str[$key] = trim_script($val);
		}
 	}else{
 		$str = preg_replace ( '/\<([\/]?)script([^\>]*?)\>/si', '&lt;\\1script\\2&gt;', $str );
		$str = preg_replace ( '/\<([\/]?)iframe([^\>]*?)\>/si', '&lt;\\1iframe\\2&gt;', $str );
		$str = preg_replace ( '/\<([\/]?)frame([^\>]*?)\>/si', '&lt;\\1frame\\2&gt;', $str );
		$str = preg_replace ( '/]]\>/si', ']] >', $str );
 	}
	return $str;
}
?>
<?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("#[\r\n\t ]{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("#[\r\n\t ]{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
        $text = preg_replace('/\r?\n/','',$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','[\1\2]',$text);
        //过滤多余html
        if ( empty($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;
    }

?>
<?php
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; 
}
?>

end

 

 

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评论:

2013-01-17 13:05

代码好复杂哦

2013-01-10 10:52

函数的东西挺好的哦

2013-01-07 15:20

符合这样数字