首页 后端开发 php教程 php 过滤非法与特殊字符串的方法

php 过滤非法与特殊字符串的方法

Jul 25, 2016 am 08:56 AM
php字符串

在留言板中,有时需要对用户输入内容进行过滤,将一些非法与特殊字符串进行过滤处理,将其替换为*。下面本篇文章就来给大家分享一下过滤功能的实现代码,希望对大家有所帮助!

php 过滤非法与特殊字符串的方法

需求:用户在评论页面输入非法字符以后,需要将非法字符替换为*

简单实现方法:

1、index.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />  
<title>过滤留言板中的非法字符</title>  
<style type="text/css">  
<!--  
body {  
    margin-left: 0px;  
    margin-top: 0px;  
    margin-right: 0px;  
    margin-bottom: 0px;  
}  
-->  
</style></head>  
<body>  
<table width="1002" height="585" border="0" align="center" cellpadding="0" cellspacing="0">  
  <tr>  
    <td width="379" height="226"> </td>  
    <td width="445"> </td>  
    <td width="178"> </td>  
  </tr>  
     <form id="form1" name="form1" method="post" action="index_ok.php">  
  <tr>  
    <td height="260"> </td>  
    <td align="center" valign="top"><table width="430" border="1" cellpadding="1" cellspacing="1" bordercolor="#FFFFFF" bgcolor="#99CC67">  
      <tr>  
        <td width="81" height="30" align="right" bgcolor="#FFFFFF">发布主题:</td>  
        <td width="307" align="left" bgcolor="#FFFFFF"><input name="title" type="text" id="title" size="30" /></td>  
      </tr>  
      <tr>  
        <td align="right" bgcolor="#FFFFFF">发布内容:</td>  
        <td align="left" bgcolor="#FFFFFF"><textarea name="content" cols="43" rows="13" id="content"></textarea></td>  
      </tr>  
    </table></td>  
    <td> </td>  
  </tr>  
  <tr>  
    <td height="99"> </td>  
    <td align="center" valign="top"><table width="315" height="37" border="0" cellpadding="0" cellspacing="0">  
      <tr>  
        <td width="169" align="center"><input type="image" name="imageField" src="images/bg1.JPG" /></td>  
        <td width="146" align="center"><input type="image" name="imageField2" src="images/bg3.JPG" onclick="form.reset();return false;" /></td>  
      </tr>  
    </table></td>  
    <td> </td>  
  </tr>  
      </form>  
</table>  
</body>  
</html>
登录后复制

2、index_ok.php

<?php   
$title=$_POST[title];  
$content=$_POST[content];  
$str="****";  
$titles = preg_replace("/(黑客)|(抓包)|(监听)/",$str,$title);  
$contents = preg_replace("/(黑客)|(抓包)|(监听)/",$str,$content);  
?>  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />  
<title>过滤留言板中的非法字符</title>  
<style type="text/css">  
<!--  
body {  
    margin-left: 0px;  
    margin-top: 0px;  
    margin-right: 0px;  
    margin-bottom: 0px;  
}  
.STYLE1 {  
    font-size: 12px;  
    color: #855201;  
}  
-->  
</style></head>  
<body>  
<table width="1002" height="585" border="0" align="center" cellpadding="0" cellspacing="0">  
  <tr>  
    <td width="400" height="226"> </td>  
    <td width="406"> </td>  
    <td width="196"> </td>  
  </tr>  
     <form id="form1" name="form1" method="post" action="index_ok.php">  
  <tr>  
    <td height="260"> </td>  
    <td align="left" valign="top"><p class="STYLE1">发布主题:<?php echo $titles;?></p>  
      <p class="STYLE1">发布内容:<?php echo $contents;?></p></td>  
    <td> </td>  
  </tr>  
  <tr>  
    <td> </td>  
    <td align="center" valign="top"> </td>  
    <td> </td>  
  </tr>  
  </form>  
</table>  
</body>  
</html>
登录后复制

运行结果

1.png

复杂实现方法:可过滤JS 、PHP标签

  //简单过滤JS 、PHP标签
  function cleanJs($html){
  	$html=trim($html);
  	$html=str_replace(array(&#39;<?&#39;,&#39;?>&#39;),array(&#39;<?&#39;,&#39;?>&#39;),$html);
  	$pattern=array(
    "&#39;<script[^>]*?>.*?</script>&#39;si",
    "&#39;<style[^>]*?>.*?</style>&#39;si",
    "&#39;<frame[^>]*?>&#39;si",
    "&#39;<iframe[^>]*?>.*?</iframe>&#39;si",
    "&#39;<link[^>]*?>&#39;si"
    );
    $replace=array("","","","","");
    return	preg_replace($pattern,$replace,$html);
  }
  /* Remove JS/CSS/IFRAME/FRAME 过滤JS/CSS/IFRAME/FRAME/XSS等恶意攻击代码(可安全使用)
   * Return string
   */
  function cleanJsCss($html){
  	$html=trim($html);
  	$html=preg_replace(&#39;/\0+/&#39;, &#39;&#39;, $html);
	$html=preg_replace(&#39;/(\\\\0)+/&#39;, &#39;&#39;, $html);
	$html=preg_replace(&#39;#(&\#*\w+)[\x00-\x20]+;#u&#39;,"\\1;",$html);
	$html=preg_replace(&#39;#(&\#x*)([0-9A-F]+);*#iu&#39;,"\\1\\2;",$html);
	$html=preg_replace("/%u0([a-z0-9]{3})/i", "&#x\\1;", $html);
	$html=preg_replace("/%([a-z0-9]{2})/i", "&#x\\1;", $html);
  	$html=str_replace(array(&#39;<?&#39;,&#39;?>&#39;),array(&#39;<?&#39;,&#39;?>&#39;),$html);
    $html=preg_replace(&#39;#\t+#&#39;,&#39; &#39;,$html);
	$scripts=array(&#39;javascript&#39;,&#39;vbscript&#39;,&#39;script&#39;,&#39;applet&#39;,&#39;alert&#39;,&#39;document&#39;,&#39;write&#39;,&#39;cookie&#39;,&#39;window&#39;);
	foreach($scripts as $script){
		$temp_str="";
		for($i=0;$i<strlen($script);$i++){
			$temp_str.=substr($script,$i,1)."\s*";
		}
		$temp_str=substr($temp_str,0,-3);
		$html=preg_replace(&#39;#&#39;.$temp_str.&#39;#s&#39;,$script,$html);
		$html=preg_replace(&#39;#&#39;.ucfirst($temp_str).&#39;#s&#39;,ucfirst($script),$html);
	}
	$html=preg_replace("#<a.+?href=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>.*?</a>#si", "", $html);
	$html=preg_replace("#<img.+?src=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>#si", "", $html);
	$html=preg_replace("#<(script|xss).*?\>#si", "<\\1>", $html);
	$html=preg_replace(&#39;#(<[^>]*?)(onblur|onchange|onclick|onfocus|onload|onmouseover|onmouseup|onmousedown|onselect|onsubmit|onunload|onkeypress|onkeydown|onkeyup|onresize)[^>]*>#is&#39;,"\\1>",$html);
	//$html=preg_replace(&#39;#<(/*\s*)(alert|applet|basefont|base|behavior|bgsound|blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input|layer|link|meta|object|plaintext|style|script|textarea|title|xml|xss)([^>]*)>#is&#39;, "<\\1\\2\\3>", $html);
	$html=preg_replace(&#39;#<(/*\s*)(alert|applet|basefont|base|behavior|bgsound|blink|body|expression|form|frameset|frame|head|html|ilayer|iframe|input|layer|link|meta|object|plaintext|style|script|textarea|title|xml|xss)([^>]*)>#is&#39;, "<\\1\\2\\3>", $html);
	$html=preg_replace(&#39;#(alert|cmd|passthru|eval|exec|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si&#39;, "\\1\\2(\\3)", $html);
	$bad=array(
	&#39;document.cookie&#39;	=> &#39;&#39;,
	&#39;document.write&#39;	=> &#39;&#39;,
	&#39;window.location&#39;	=> &#39;&#39;,
	"javascript\s*:"	=> &#39;&#39;,
	"Redirect\s+302"	=> &#39;&#39;,
	&#39;<!--&#39;				=> &#39;<!--&#39;,
	&#39;-->&#39;				=> &#39;-->&#39;
	);
	foreach ($bad as $key=>$val){
		$html=preg_replace("#".$key."#i",$val,$html);
	}
    return	$html;
  }
  //过滤html标签以及敏感字符

  function cleanHtml($html){
  	return cleanYellow(htmlspecialchars($html));
  }
  //过滤部分HTML标签

  function cleanFilter($html){
  	$html=trim($html);
  	$html=preg_replace("/<p[^>]*?>/is","<p>",$html);
  	$html=preg_replace("/<div[^>]*?>/is","<div>",$html);
  	$html=preg_replace("/<ul[^>]*?>/is","<ul>",$html);
  	$html=preg_replace("/<li[^>]*?>/is","<li>",$html);
  	$html=preg_replace("/<span[^>]*?/is","<span>",$html);
  	$html=preg_replace("/<a[^>]*?>(.*)?<\/a>/is","\${1}",$html);
  	$html=preg_replace("/<table[^>]*?>/is","<table>",$html);
  	$html=preg_replace("/<tr[^>]*?>/is","<tr>",$html);
  	$html=preg_replace("/<td[^>]*?>/is","<td>",$html);
  	$html=preg_replace("/<ol[^>]*?>/is","<ol>",$html);
  	$html=preg_replace("/<form[^>]*?>/is","",$html);
  	$html=preg_replace("/<input[^>]*?>/is","",$html);
  	return $html;
  }
  //过滤非法的敏感字符串
  function cleanYellow($txt){
  	$txt=str_replace(
  	array("黄色","性爱","做爱","我日","我草","我靠","尻","共产党","胡锦涛","毛泽东",
  	"政府","中央","研究生考试","性生活","色情","情色","我考","麻痹","妈的","阴道",
  	"淫","奸","阴部","爱液","阴液","臀","色诱","煞笔","傻比","阴茎","法轮功","性交","阴毛","江泽民"),
  	array("*1*","*2*","*3*","*4*","*5*","*6*","*7*","*8*","*9*","*10*",
  	"*11*","*12*","*13*","*14*","*15*","*16*","*17*","*18*","*19*","*20*",
  	"*21*","*22*","*23*","*24*","*25*","*26*","*27*","*28*","*29*","*30*","*31*","*32*","*33*","*34*"),
  	$txt);
  	return $txt;
  }
  //过滤敏感字符串以及恶意代码
  function cleanAll($html){
  	return cleanYellow(cleanJsCss($html));
  }
  //全半角字符替换
  function setFilter($html){
  		$arr=array(&#39;0&#39; => &#39;0&#39;, &#39;1&#39; => &#39;1&#39;, &#39;2&#39; => &#39;2&#39;, &#39;3&#39; => &#39;3&#39;, &#39;4&#39; => &#39;4&#39;,
                 &#39;5&#39; => &#39;5&#39;, &#39;6&#39; => &#39;6&#39;, &#39;7&#39; => &#39;7&#39;, &#39;8&#39; => &#39;8&#39;, &#39;9&#39; => &#39;9&#39;,
                 &#39;A&#39; => &#39;A&#39;, &#39;B&#39; => &#39;B&#39;, &#39;C&#39; => &#39;C&#39;, &#39;D&#39; => &#39;D&#39;, &#39;E&#39; => &#39;E&#39;,
                 &#39;F&#39; => &#39;F&#39;, &#39;G&#39; => &#39;G&#39;, &#39;H&#39; => &#39;H&#39;, &#39;I&#39; => &#39;I&#39;, &#39;J&#39; => &#39;J&#39;,
                 &#39;K&#39; => &#39;K&#39;, &#39;L&#39; => &#39;L&#39;, &#39;M&#39; => &#39;M&#39;, &#39;N&#39; => &#39;N&#39;, &#39;O&#39; => &#39;O&#39;,
                 &#39;P&#39; => &#39;P&#39;, &#39;Q&#39; => &#39;Q&#39;, &#39;R&#39; => &#39;R&#39;, &#39;S&#39; => &#39;S&#39;, &#39;T&#39; => &#39;T&#39;,
                 &#39;U&#39; => &#39;U&#39;, &#39;V&#39; => &#39;V&#39;, &#39;W&#39; => &#39;W&#39;, &#39;X&#39; => &#39;X&#39;, &#39;Y&#39; => &#39;Y&#39;,
                 &#39;Z&#39; => &#39;Z&#39;, &#39;a&#39; => &#39;a&#39;, &#39;b&#39; => &#39;b&#39;, &#39;c&#39; => &#39;c&#39;, &#39;d&#39; => &#39;d&#39;,
                 &#39;e&#39; => &#39;e&#39;, &#39;f&#39; => &#39;f&#39;, &#39;g&#39; => &#39;g&#39;, &#39;h&#39; => &#39;h&#39;, &#39;i&#39; => &#39;i&#39;,
                 &#39;j&#39; => &#39;j&#39;, &#39;k&#39; => &#39;k&#39;, &#39;l&#39; => &#39;l&#39;, &#39;m&#39; => &#39;m&#39;, &#39;n&#39; => &#39;n&#39;,
                 &#39;o&#39; => &#39;o&#39;, &#39;p&#39; => &#39;p&#39;, &#39;q&#39; => &#39;q&#39;, &#39;r&#39; => &#39;r&#39;, &#39;s&#39; => &#39;s&#39;,
                 &#39;t&#39; => &#39;t&#39;, &#39;u&#39; => &#39;u&#39;, &#39;v&#39; => &#39;v&#39;, &#39;w&#39; => &#39;w&#39;, &#39;x&#39; => &#39;x&#39;,
                 &#39;y&#39; => &#39;y&#39;, &#39;z&#39; => &#39;z&#39;,
                 &#39;(&#39; => &#39;(&#39;, &#39;)&#39; => &#39;)&#39;, &#39;〔&#39; => &#39;[&#39;, &#39;〕&#39; => &#39;]&#39;, &#39;【&#39; => &#39;[&#39;,
                 &#39;】&#39; => &#39;]&#39;, &#39;〖&#39; => &#39;[&#39;, &#39;〗&#39; => &#39;]&#39;, &#39;“&#39; => &#39;[&#39;, &#39;”&#39; => &#39;]&#39;,
                 &#39;‘&#39; => &#39;[&#39;, &#39;’&#39; => &#39;]&#39;, &#39;{&#39; => &#39;{&#39;, &#39;}&#39; => &#39;}&#39;, &#39;《&#39; => &#39;<&#39;,
                 &#39;》&#39; => &#39;>&#39;,
                 &#39;%&#39; => &#39;%&#39;, &#39;+&#39; => &#39;+&#39;, &#39;—&#39; => &#39;-&#39;, &#39;-&#39; => &#39;-&#39;, &#39;~&#39; => &#39;-&#39;,
                 &#39;:&#39; => &#39;:&#39;, &#39;。&#39; => &#39;.&#39;, &#39;、&#39; => &#39;,&#39;, &#39;,&#39; => &#39;.&#39;, &#39;、&#39; => &#39;.&#39;,
                 &#39;;&#39; => &#39;,&#39;, &#39;?&#39; => &#39;?&#39;, &#39;!&#39; => &#39;!&#39;, &#39;…&#39; => &#39;-&#39;, &#39;‖&#39; => &#39;|&#39;,
                 &#39;”&#39; => &#39;"&#39;, &#39;’&#39; => &#39;`&#39;, &#39;‘&#39; => &#39;`&#39;, &#39;|&#39; => &#39;|&#39;, &#39;〃&#39; => &#39;"&#39;,
                 &#39; &#39; => &#39; &#39;);
    	return	strtr($html,$arr);
  }
登录后复制

推荐学习:《PHP视频教程

本站声明
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系admin@php.cn

热AI工具

Undresser.AI Undress

Undresser.AI Undress

人工智能驱动的应用程序,用于创建逼真的裸体照片

AI Clothes Remover

AI Clothes Remover

用于从照片中去除衣服的在线人工智能工具。

Undress AI Tool

Undress AI Tool

免费脱衣服图片

Clothoff.io

Clothoff.io

AI脱衣机

AI Hentai Generator

AI Hentai Generator

免费生成ai无尽的。

热门文章

R.E.P.O.能量晶体解释及其做什么(黄色晶体)
1 个月前 By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O.最佳图形设置
1 个月前 By 尊渡假赌尊渡假赌尊渡假赌
威尔R.E.P.O.有交叉游戏吗?
1 个月前 By 尊渡假赌尊渡假赌尊渡假赌

热工具

记事本++7.3.1

记事本++7.3.1

好用且免费的代码编辑器

SublimeText3汉化版

SublimeText3汉化版

中文版,非常好用

禅工作室 13.0.1

禅工作室 13.0.1

功能强大的PHP集成开发环境

Dreamweaver CS6

Dreamweaver CS6

视觉化网页开发工具

SublimeText3 Mac版

SublimeText3 Mac版

神级代码编辑软件(SublimeText3)

php怎么将字符转ascii码 php怎么将字符转ascii码 Mar 03, 2023 pm 06:55 PM

在php中,可以使用ord()函数来将字符转成ascii码,该函数可以返回单个字符或字符串中第一个字符的ASCII值,返回的ASCII值会以整数形式显示;转换语法“ord(string)”,参数“string”不可省略,是要从中获得ASCII值的字符串(或单个字符)。

php字符串怎么替换某个字符为空 php字符串怎么替换某个字符为空 Mar 06, 2023 pm 06:39 PM

php字符串替换某个字符为空的两种方法:1、使用str_replace()函数将指定字符替换为空字符,只需要将第一个参数设置为指定字符,第二个参数设置为空字符,语法“str_replace("指定字符","", $str)”;2、用preg_replace()函数配合正则表达式来匹配指定字符并将其替换空字符,语法“preg_replace('/指定字符/',"",$str)”。

php怎么去除字符串中的所有大写字母 php怎么去除字符串中的所有大写字母 Sep 26, 2022 pm 07:59 PM

两种去除方法:1、利用preg_replace()执行正则表达式搜索所有大写字母并将其替换为空字符即可,语法“preg_replace('/[A-Z]/','',$str)”。2、利用preg_filter()执行正则表达式搜索所有大写字母并将其替换为空字符即可,语法“preg_filter('/[A-Z]/','',$str)”。

php怎么去除字符串中左右字符 php怎么去除字符串中左右字符 Mar 27, 2023 pm 03:29 PM

PHP是一种强制类型编程语言,经常被用来开发Web应用程序。在Web开发过程中,您可能需要对字符串执行各种操作,例如从字符串中删除特定字符,保留字符串中的数字或字母等。在本文中,我们将重点介绍PHP中如何删除字符串左侧或右侧的特定字符。

php字符串怎么只提取中文字符 php字符串怎么只提取中文字符 Sep 22, 2022 pm 07:44 PM

两种方法:1、用preg_match_all()配合正则过滤字符串,语法“preg_match_all("/[\x{4e00}-\x{9fff}] /u","$str",$arr);”;2、用preg_replace()配合正则搜索字符串中的非中文字母,并将其替换成空字符,语法“preg_replace("/[^\x{4E00}-\x{9FFF}] /u",'',$str)”。

php怎么去除字符串中的双引号 php怎么去除字符串中的双引号 Mar 28, 2023 pm 04:54 PM

PHP是一种非常流行的编程语言,是建立动态网站的首选工具之一。在PHP开发中,我们经常需要操作字符串,其中一个常见的需求是去除字符串中的双引号。在这篇文章中,我们将介绍一些方法来去除PHP字符串中的双引号。

php给字符串添加字符可以吗 php给字符串添加字符可以吗 Aug 19, 2022 pm 07:51 PM

php可以给字符串添加字符。两种实现方法:1、使用字符串连接符“.”将指定字符拼接到字符串的开头或末尾即可,语法“指定字符 . 字符串”或“字符串 . 指定字符 ”;2、使用substr_replace()函数在字符串的指定位置插入指定字符即可,语法“substr_replace(字符串,指定字符,指定位置,0)”,指定位置的值可以是0、负值和正值。

如何使用PHP将字符串转换成日期时间格式 如何使用PHP将字符串转换成日期时间格式 Mar 27, 2023 pm 05:24 PM

PHP是一种常用的服务器端脚本语言,在Web开发中广泛应用。PHP对字符串的处理相当灵活,使得字符串转换成日期时间格式变得简单。本文将为大家介绍如何使用PHP将字符串转换成日期时间格式。

See all articles