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本文介绍下，php实现的过滤非法字符与特殊字符串的方法，有需要的朋友参考下。
提供几段函数，实现非法字符串、特殊字符串的过滤方法。
代码：
'),array(''),$html);
$pattern=array(
"''si",
"']*?>.*?'si",
"']*?>'si",
"']*?>.*?'si",
"']*?>'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('/\0+/', '', $html);
$html=preg_replace('/(\\\\0)+/', '', $html);
$html=preg_replace('#(&\#*\w+)[\x00-\x20]+;#u',"\\1;",$html);
$html=preg_replace('#(&\#x*)([0-9A-F]+);*#iu',"\\1\\2;",$html);
$html=preg_replace("/%u0([a-z0-9]{3})/i", "&#x\\1;", $html);
$html=preg_replace("/%([a-z0-9]{2})/i", "&#x\\1;", $html);
$html=str_replace(array(''),array(''),$html);
$html=preg_replace('#\t+#',' ',$html);
$scripts=array('javascript','vbscript','script','applet','alert','document','write','cookie','window');
foreach($scripts as $script){
$temp_str="";
for($i=0;$i#si", "", $html);
$html=preg_replace("#<(script|xss).*?\>#si", "<\\1>", $html);
$html=preg_replace('#(<[^>]*?)(onblur|onchange|onclick|onfocus|onload|onmouseover|onmouseup|onmousedown|onselect|onsubmit|onunload|
onkeypress|onkeydown|onkeyup|onresize)[^>]*>#is',"\\1>",$html);
//$html=preg_replace('#<(/*\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', "<\\1\\2\\3>", $html);
$html=preg_replace('#<(/*\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', "<\\1\\2\\3>", $html);
$html=preg_replace('#(alert|cmd|passthru|eval|exec|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si',
"\\1\\2(\\3)", $html);
$bad=array(
'document.cookie' => '',
'document.write' => '',
'window.location' => '',
"javascript\s*:" => '',
"Redirect\s+302" => '',
'' => '-->'
);
foreach ($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);
$html=preg_replace("/]*?>/is","",$html);
$html=preg_replace("/]*?>/is","",$html);
$html=preg_replace("/]*?>/is","",$html);
$html=preg_replace("/]*?>/is","- ",$html);
$html=preg_replace("/]*?/is","",$html);
$html=preg_replace("/]*?>(.*)?<\/a>/is","\$发达",$html);
$html=preg_replace("/]*?>/is","
",$html);
$html=preg_replace("/]*?>/is","",$html);
$html=preg_replace("/]*?>/is","",$html);
$html=preg_replace("/]*?>/is","",$html);
$html=preg_replace("/]*?>/is","",$html);
$html=preg_replace("/]*?>/is","",$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){
$arr=array('０' => '0', '１' => '1', '２' => '2', '３' => '3', '４' => '4',
'５' => '5', '６' => '6', '７' => '7', '８' => '8', '９' => '9',
'Ａ' => 'A', 'Ｂ' => 'B', 'Ｃ' => 'C', 'Ｄ' => 'D', 'Ｅ' => 'E',
'Ｆ' => 'F', 'Ｇ' => 'G', 'Ｈ' => 'H', 'Ｉ' => 'I', 'Ｊ' => 'J',
'Ｋ' => 'K', 'Ｌ' => 'L', 'Ｍ' => 'M', 'Ｎ' => 'N', 'Ｏ' => 'O',
'Ｐ' => 'P', 'Ｑ' => 'Q', 'Ｒ' => 'R', 'Ｓ' => 'S', 'Ｔ' => 'T',
'Ｕ' => 'U', 'Ｖ' => 'V', 'Ｗ' => 'W', 'Ｘ' => 'X', 'Ｙ' => 'Y',
'Ｚ' => 'Z', 'ａ' => 'a', 'ｂ' => 'b', 'ｃ' => 'c', 'ｄ' => 'd',
'ｅ' => 'e', 'ｆ' => 'f', 'ｇ' => 'g', 'ｈ' => 'h', 'ｉ' => 'i',
'ｊ' => 'j', 'ｋ' => 'k', 'ｌ' => 'l', 'ｍ' => 'm', 'ｎ' => 'n',
'ｏ' => 'o', 'ｐ' => 'p', 'ｑ' => 'q', 'ｒ' => 'r', 'ｓ' => 's',
'ｔ' => 't', 'ｕ' => 'u', 'ｖ' => 'v', 'ｗ' => 'w', 'ｘ' => 'x',
'ｙ' => 'y', 'ｚ' => 'z',
'（' => '(', '）' => ')', '〔' => '[', '〕' => ']', '【' => '[',
'】' => ']', '〖' => '[', '〗' => ']', '“' => '[', '”' => ']',
'‘' => '[', '’' => ']', '｛' => '{', '｝' => '}', '《' => '<',
'》' => '>',
'％' => '%', '＋' => '+', '—' => '-', '－' => '-', '～' => '-',
'：' => ':', '。' => '.', '、' => ',', '，' => '.', '、' => '.',
'；' => ',', '？' => '?', '！' => '!', '…' => '-', '‖' => '|',
'”' => '"', '’' => '`', '‘' => '`', '｜' => '|', '〃' => '"',
' ' => ' ');
return strtr($html,$arr);
}
//搜集整理：bbs.it-home.org
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