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php過(guò)濾所有惡意字符(批量過(guò)濾post,get敏感數(shù)據(jù))

更新時(shí)間：2014年03月18日 16:51:49 作者：

最近dedecms報(bào)漏洞不斷，這里分享下php的過(guò)濾函數(shù)，大牛飄過(guò)吧,給小黑闊們學(xué)習(xí)交流用

函數(shù)代碼：

//php 批量過(guò)濾post,get敏感數(shù)據(jù) 
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 $array; 
} 
//過(guò)濾 
function htmlencode($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 $str; 
} 
//解碼 
function htmldecode($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 $str; 
} 
// 函數(shù)：string_filter($string, $match_type=1) 
// 功能：過(guò)濾非法內(nèi)容 
// 參數(shù)： 
// $string 需要檢查的字符串 
// $match_type 匹配類型,1為精確匹配, 2為模糊匹配，默認(rèn)為1 
// 
// 返回：有非法內(nèi)容返回True，無(wú)非法內(nèi)容返回False 
// 其他：非法關(guān)鍵字列表保存在txt文件里, 分為普通非法關(guān)鍵字和嚴(yán)重非法關(guān)鍵字兩個(gè)列表 
// 作者：heiyeluren 
// 時(shí)間：2006-1-18 
// 
//====================================================================== 
function lib_lawless_string_filter($string, $match_type=1) 
{ 
//字符串空直接返回為非法 
$string = trim($string); 
if (empty($string)) 
{ 
return false; 
} 
//獲取重要關(guān)鍵字列表和普通關(guān)鍵字列表 
$common_file = "common_list.txt"; //通用過(guò)濾關(guān)鍵字列表 
$signify_file = "signify_list.txt"; //重要過(guò)濾關(guān)鍵字列表 
//如果任何列表文件不存在直接返回false，否則把兩個(gè)文件列表讀取到兩個(gè)數(shù)組里 
if (!file_exists($common_file) || !file_exists($signify_file)) 
{ 
return false; 
} 
$common_list = file($common_file); 
$signify_list = file($signify_file); 
//精確匹配 
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, $signify_list); 
} 
//判斷檢索結(jié)果數(shù)組中是否有數(shù)據(jù)，如果有，證明是非法的 
if (is_array($is_lawless) && !empty($is_lawless)) 
{ 
return true; 
} 
else
{ 
return false; 
} 
} 
//--------------------- 
// 精確匹配,為過(guò)濾服務(wù) 
//--------------------- 
function exact_match($string, $common_list) 
{ 
$string = trim($string); 
$string = lib_replace_end_tag($string); 
//檢索普通過(guò)濾關(guān)鍵字列表 
foreach($common_list as $block) 
{ 
$block = trim($block); 
if (preg_match("/^$string$/i", $block)) 
{ 
$blist[] = $block; 
} 
} 
//判斷有沒有過(guò)濾內(nèi)容在數(shù)組里 
if (!empty($blist)) 
{ 
return array_unique($blist); 
} 
return false; 
} 
//---------------------- 
// 模糊匹配,為過(guò)濾服務(wù) 
//---------------------- 
function blur_match($string, $common_list, $signify_list) 
{ 
$string = trim($string); 
$s_len = strlen($string); 
$string = lib_replace_end_tag($string); 
//檢索普通過(guò)濾關(guān)鍵字列表 
foreach($common_list as $block) 
{ 
$block = trim($block); 
if (preg_match("/^$string$/i", $block)) 
{ 
$blist[] = $block; 
} 
} 
//檢索嚴(yán)重過(guò)濾關(guān)鍵字列表 
foreach($signify_list as $block) 
{ 
$block = trim($block); 
if ($s_len>=strlen($block) && preg_match("/$block/i", $string)) 
{ 
$blist[] = $block; 
} 
} 
//判斷有沒有過(guò)濾內(nèi)容在數(shù)組里 
if (!empty($blist)) 
{ 
return array_unique($blist); 
} 
return false; 
} 
//-------------------------- 
// 替換HTML尾標(biāo)簽,為過(guò)濾服務(wù) 
//-------------------------- 
function lib_replace_end_tag($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標(biāo)簽，可以作為擴(kuò)展過(guò)濾 
/* 
$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" ); 
*/
}