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php过滤html字符串，防止SQL注入,用函数把将要写入到数据库的字符串处理下，过滤非法信息，以及恶意的html代码！ 代码： //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);
$str=str_replace(chr(34),$str);
$str=str_replace(chr(39),"'",$str);
$str=str_replace(chr(13),"<br />",$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;
$str=str_replace("select",$str);
$str=str_replace("cas","cast",$str);
$str=str_replace("&",$str);
$str=str_replace(" ",chr(32),chr(9),chr(34),chr(39),$str);
$str=str_replace("<br />",chr(13),$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,$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);
$str = str_replace("<SCRIPT>",$str);
$str = str_replace("</SCRIPT>",$str);
$str = str_replace("<script>",$str);
$str = str_replace("</script>",$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" );
*/
} 代码： 引用是直接这样：
$xxx = htmlspecialchars($_POST['xxx']);
或者
$xxx = htmlspecialchars($_GET['xxx']); （编辑：李大同）
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