php 安全过滤函数代码

/**
* 安全过滤类-过滤javascript,css,iframes,object等不安全参数 过滤级别高
*  Controller中使用方法：$this->controller->fliter_script($value)
* @param  string $value 需要过滤的值
* @return string
*/
function fliter_script($value) {
$value = preg_replace("/(javascript:)?on(click|load|key|mouse|error|abort|move|unload|change|dblclick|move|reset|resize|submit)/i","&111n\\2",$value);
$value = preg_replace("/(.*?)<\/script>/si","",$value);
$value = preg_replace("/(.*?)<\/iframe>/si","",$value);
$value = preg_replace ("//iesU", ‘‘, $value);
return $value;
}

/**
* 安全过滤类-过滤HTML标签
*  Controller中使用方法：$this->controller->fliter_html($value)
* @param  string $value 需要过滤的值
* @return string
*/
function fliter_html($value) {
if (function_exists(‘htmlspecialchars‘)) return htmlspecialchars($value);
return str_replace(array("&", ‘"‘, "‘", "<", ">"), array("&", "\"", "‘", "<", ">"), $value);
}

/**
* 安全过滤类-对进入的数据加下划线 防止SQL注入
*  Controller中使用方法：$this->controller->fliter_sql($value)
* @param  string $value 需要过滤的值
* @return string
*/
function fliter_sql($value) {
$sql = array("select", ‘insert‘, "update", "delete", "\‘", "\/\*", 
     "\.\.\/", "\.\/", "union", "into", "load_file", "outfile");
$sql_re = array("","","","","","","","","","","","");
return str_replace($sql, $sql_re, $value);
}

/**
* 安全过滤类-通用数据过滤
*  Controller中使用方法：$this->controller->fliter_escape($value)
* @param string $value 需要过滤的变量
* @return string|array
*/
function fliter_escape($value) {
if (is_array($value)) {
  foreach ($value as $k => $v) {
   $value[$k] = self::fliter_str($v);
  }
} else {
  $value = self::fliter_str($value);
}
return $value;
}

/**
* 安全过滤类-字符串过滤 过滤特殊有危害字符
*  Controller中使用方法：$this->controller->fliter_str($value)
* @param  string $value 需要过滤的值
* @return string
*/
function fliter_str($value) {
$badstr = array("\0", "%00", "\r", ‘&‘, ‘ ‘, ‘"‘, "‘", "<", ">", "   ", "%3C", "%3E");
$newstr = array(‘‘, ‘‘, ‘‘, ‘&‘, ‘ ‘, ‘"‘, ‘‘‘, "<", ">", "   ", "<", ">");
$value  = str_replace($badstr, $newstr, $value);
$value  = preg_replace(‘/&((#(\d{3,5}|x[a-fA-F0-9]{4}));)/‘, ‘&\\1‘, $value);
return $value;
}

/**
* 私有路劲安全转化
*  Controller中使用方法：$this->controller->filter_dir($fileName)
* @param string $fileName
* @return string
*/
function filter_dir($fileName) {
$tmpname = strtolower($fileName);
$temp = array(‘:/‘,"\0", "..");
if (str_replace($temp, ‘‘, $tmpname) !== $tmpname) {
  return false;
}
return $fileName;
}

/**
* 过滤目录
*  Controller中使用方法：$this->controller->filter_path($path)
* @param string $path
* @return array
*/
public function filter_path($path) {
$path = str_replace(array("‘",‘#‘,‘=‘,‘`‘,‘$‘,‘%‘,‘&‘,‘;‘), ‘‘, $path);
return rtrim(preg_replace(‘/(\/){2,}|(\\\){1,}/‘, ‘/‘, $path), ‘/‘);
}

/**
* 过滤PHP标签
*  Controller中使用方法：$this->controller->filter_phptag($string)
* @param string $string
* @return string
*/
public function filter_phptag($string) {
return str_replace(array(‘‘), array(‘<?‘, ‘?>‘), $string);
}

/**
* 安全过滤类-返回函数
*  Controller中使用方法：$this->controller->str_out($value)
* @param  string $value 需要过滤的值
* @return string
*/
public function str_out($value) {
$badstr = array("<", ">", "%3C", "%3E");
$newstr = array("<", ">", "<", ">");
$value  = str_replace($newstr, $badstr, $value);
return stripslashes($value); //下划线
}

<?php

 header("Content-type:text/html;charset=utf-8");
 $str = ‘<script type="text/javascript" src="dd.js"></script>
测试php正则匹配掉js代码测试php正则匹配掉js代码测试php正则匹配掉js代码测试php正则匹配掉js代码测试php正则匹配掉js代码测试php正则匹配掉js代码
<script type="text/javascript" src="123.js"></script>
<script type="text/javascript">
 var aa = "sdsds";
 alert(aa);
</script>
测试php正则匹配掉js代码‘;

 $preg = "/<script[\s\S]*?<\/script>/i";
 $newstr = preg_replace($preg,"",$str,3);    //第四个参数中的3表示替换3次，默认是-1，替换全部
 echo $newstr;

?>

//php 批量过滤post,get敏感数据
 
if (get_magic_quotes_gpc()) {
 
$_GET = stripslashes_array($_GET);
 
$_POST = stripslashes_array($_POST);
 
}
 
function stripslashes_array(&$array) {
 
while(list($key,$var) = each($array)) {
 
if ($key != ‘argc‘ && $key != ‘argv‘ && (strtoupper($key) != $key || ‘‘.intval($key) == "$key")) {
 
if (is_string($var)) {
 
$array[$key] = stripslashes($var);
 
}
 
if (is_array($var)) {
 
$array[$key] = stripslashes_array($var);
 
}
 
}
 
}
 
return $array;
 
}
 
//过滤
 
function htmlencode($str){
 
if(empty($str)) return;
 
if($str=="") return $str;
 
$str=trim($str);
 
$str=str_replace("&","&",$str);
 
$str=str_replace(">",">",$str);
 
$str=str_replace("<","<",$str);
 
$str=str_replace(chr(32)," ",$str);
 
$str=str_replace(chr(9)," ",$str);
 
$str=str_replace(chr(9)," ",$str);
 
$str=str_replace(chr(34),"&",$str);
 
$str=str_replace(chr(39),"‘",$str);
 
$str=str_replace(chr(13),"
 
",$str);
 
$str=str_replace("‘","‘‘",$str);
 
$str=str_replace("select","select",$str);
 
$str=str_replace("SCRIPT","SCRIPT",$str);
 
$str=str_replace("script","script",$str);
 
$str=str_replace("join","join",$str);
 
$str=str_replace("union","union",$str);
 
$str=str_replace("where","where",$str);
 
$str=str_replace("insert","insert",$str);
 
$str=str_replace("delete","delete",$str);
 
$str=str_replace("update","update",$str);
 
$str=str_replace("like","like",$str);
 
$str=str_replace("drop","drop",$str);
 
$str=str_replace("create","create",$str);
 
$str=str_replace("modify","modify",$str);
 
$str=str_replace("rename","rename",$str);
 
$str=str_replace("alter","alter",$str);
 
$str=str_replace("cast","cas",$str);
 
return $str;
 
}
 
//解码
 
function htmldecode($str){
 
if(empty($str)) return;
 
if($str=="") return $str;
 
$str=str_replace("select","select",$str);
 
$str=str_replace("join","join",$str);
 
$str=str_replace("union","union",$str);
 
$str=str_replace("where","where",$str);
 
$str=str_replace("insert","insert",$str);
 
$str=str_replace("delete","delete",$str);
 
$str=str_replace("update","update",$str);
 
$str=str_replace("like","like",$str);
 
$str=str_replace("drop","drop",$str);
 
$str=str_replace("create","create",$str);
 
$str=str_replace("modify","modify",$str);
 
$str=str_replace("rename","rename",$str);
 
$str=str_replace("alter","alter",$str);
 
$str=str_replace("cas","cast",$str);
 
$str=str_replace("&","&",$str);
 
$str=str_replace(">",">",$str);
 
$str=str_replace("<","<",$str);
 
$str=str_replace(" ",chr(32),$str);
 
$str=str_replace(" ",chr(9),$str);
 
$str=str_replace(" ",chr(9),$str);
 
$str=str_replace("&",chr(34),$str);
 
$str=str_replace("‘",chr(39),$str);
 
$str=str_replace("
 
",chr(13),$str);
 
$str=str_replace("‘‘","‘",$str);
 
return $str;
 
}
 
// 函数：string_filter($string, $match_type=1)
 
// 功能：过滤非法内容
 
// 参数：
 
// $string 需要检查的字符串
 
// $match_type 匹配类型,1为精确匹配, 2为模糊匹配，默认为1
 
//
 
// 返回：有非法内容返回True，无非法内容返回False
 
// 其他：非法关键字列表保存在txt文件里, 分为普通非法关键字和严重非法关键字两个列表
 
// 作者：heiyeluren
 
// 时间：2006-1-18
 
//
 
//======================================================================
 
function lib_lawless_string_filter($string, $match_type=1)
 
{
 
//字符串空直接返回为非法
 
$string = trim($string);
 
if (empty($string))
 
{
 
return false;
 
 
}
 
//获取重要关键字列表和普通关键字列表
 
$common_file = "common_list.txt"; //通用过滤关键字列表
 
$signify_file = "signify_list.txt"; //重要过滤关键字列表
 
//如果任何列表文件不存在直接返回false，否则把两个文件列表读取到两个数组里
 
if (!file_exists($common_file) || !file_exists($signify_file))
 
{
 
return false;
 
}
 
$common_list = file($common_file);
 
$signify_list = file($signify_file);
 
//精确匹配
 
if ($match_type == 1)
 
{
 
$is_lawless = exact_match($string, $common_list);
 
}
 
//模糊匹配
 
if ($match_type == 2)
 
{
 
$is_lawless = blur_match($string, $common_list, $signify_list);
 
}
 
//判断检索结果数组中是否有数据，如果有，证明是非法的
 
if (is_array($is_lawless) && !empty($is_lawless))
 
{
 
return true;
 
}
 
else
 
{
 
return false;
 
}
 
}
 
//---------------------
 
// 精确匹配,为过滤服务
 
//---------------------
 
function exact_match($string, $common_list)
 
{
 
$string = trim($string);
 
$string = lib_replace_end_tag($string);
 
//检索普通过滤关键字列表
 
foreach($common_list as $block)
 
{
 
$block = trim($block);
 
if (preg_match("/^$string$/i", $block))
 
{
 
$blist[] = $block;
 
}
 
}
 
//判断有没有过滤内容在数组里
 
if (!empty($blist))
 
{
 
return array_unique($blist);
 
}
 
return false;
 
}
 
//----------------------
 
// 模糊匹配,为过滤服务
 
//----------------------
 
function blur_match($string, $common_list, $signify_list)
 
{
 
$string = trim($string);
 
$s_len = strlen($string);
 
$string = lib_replace_end_tag($string);
 
//检索普通过滤关键字列表
 
foreach($common_list as $block)
 
{
 
$block = trim($block);
 
if (preg_match("/^$string$/i", $block))
 
{
 
$blist[] = $block;
 
}
 
}
 
//检索严重过滤关键字列表
 
foreach($signify_list as $block)
 
{
 
$block = trim($block);
 
if ($s_len>=strlen($block) && preg_match("/$block/i", $string))
 
{
 
$blist[] = $block;
 
}
 
}
 
//判断有没有过滤内容在数组里
 
if (!empty($blist))
 
{
 
return array_unique($blist);
 
}
 
return false;
 
}
 
//--------------------------
 
// 替换HTML尾标签,为过滤服务
 
//--------------------------
 
function lib_replace_end_tag($str)
 
{
 
if (empty($str)) return false;
 
$str = htmlspecialchars($str);
 
$str = str_replace( ‘/‘, "", $str);
 
$str = str_replace("\\", "", $str);
 
$str = str_replace(">", "", $str);
 
$str = str_replace("<", "", $str);
 
$str = str_replace("", "", $str);
 
$str = str_replace("", "", $str);
 
$str=str_replace("select","select",$str);
 
$str=str_replace("join","join",$str);
 
$str=str_replace("union","union",$str);
 
$str=str_replace("where","where",$str);
 
$str=str_replace("insert","insert",$str);
 
$str=str_replace("delete","delete",$str);
 
$str=str_replace("update","update",$str);
 
$str=str_replace("like","like",$str);
 
$str=str_replace("drop","drop",$str);
 
$str=str_replace("create","create",$str);
 
$str=str_replace("modify","modify",$str);
 
$str=str_replace("rename","rename",$str);
 
$str=str_replace("alter","alter",$str);
 
$str=str_replace("cas","cast",$str);
 
$str=str_replace("&","&",$str);
 
$str=str_replace(">",">",$str);
 
$str=str_replace("<","<",$str);
 
$str=str_replace(" ",chr(32),$str);
 
$str=str_replace(" ",chr(9),$str);
 
$str=str_replace(" ",chr(9),$str);
 
$str=str_replace("&",chr(34),$str);
 
$str=str_replace("‘",chr(39),$str);
 
$str=str_replace("
 
",chr(13),$str);
 
$str=str_replace("‘‘","‘",$str);
 
$str=str_replace("css","‘",$str);
 
$str=str_replace("CSS","‘",$str);
 
return $str;
 
//HTML标签，可以作为扩展过滤
 
/*
 
$tags = array("/html", "/head", "/body", "/div", "/span", "/DOCTYPE", "/title", "/link", "/meta", "/style", "/p", "/h1,", "/h2,", "/h3,", "/h4,", "/h5,", "/h6", "/strong", "/em", "/abbr", "/acronym", "/address", "/bdo", "/blockquote", "/cite", "/q", "/code", "/ins", "/del", "/dfn", "/kbd", "/pre", "/samp", "/var", "/br", "/a", "/img", "/area", "/map", "/object", "/param", "/ul", "/ol", "/li", "/dl", "/dt", "/dd", "/table", "/tr", "/td", "/th", "/tbody", "/thead", "/tfoot", "/col", "/colgroup", "/caption", "/form", "/input", "/textarea", "/select", "/option", "/optgroup", "/button", "/label", "/fieldset", "/legend", "/script", "/noscript", "/b", "/i", "/tt", "/sub", "/sup", "/big", "/small", "/hr" );
 
*/
 
}