php过滤所有恶意字符(批量过滤post,get敏感数据)

函数代码：

//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); 
$str=str_replace(chr(9)," ",$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" ); 
*/
}

代码：

引用是直接这样：

$xxx = htmlspecialchars($_POST['xxx']);

或者

$xxx = htmlspecialchars($_GET['xxx']);