php登录代码

session_start();

/* get post */  
 if (!function_exists("getpost")){function getpost(){if(count($_post)){foreach($_post as $key => $value){global ${$key};${$key}=$value;}}}}

/* get get */  
 if (!function_exists("getget")){function getget(){if(count($_get)){foreach($_get as $key => $value){global ${$key};$$key=($value);}}}}

/* sql escape string */
if (!function_exists("escapeit")){
function escapeit($text){ 
 if (get_magic_quotes_gpc()) $text=strips教程lashes($text);
 if (!is_numeric($text)) $text=mysql教程_real_escape_string($text);
 return $text;
}}
 
getpost(); //获取post过来的数据

$rs = $db->query("select * from `backend_user` where binary `login` = '".escapeit($login)."' and binary `password` = '".md5($password)."'");

if (mysql_num_rows($rs) > 0) {
 $row = $db->fetch_array($rs);
 $_session["smartinfo_sysid"] = $row["user_id"];
 $_session["smartinfo_syslogin"] = $row["login"];
 $db->query("update `backend_user` set `last_logon` = '".date("y-m-d h:i:s")."' where `id` = '".$row["id"]."'");
 header("location: index2.php");
} else {
 header("location: index.php?status=fail");
}