Login instance code in php _ php instance-php Tutorial

This article mainly introduces the login instance code in php, which has some reference value, interested friends can refer to the examples in this article to share with you the specific implementation code of logging on to login in php for your reference. the specific content is as follows:

<? Php require ".. /include/DBClass. php "; $ username = $ _ POST ['username']; $ password = $ _ POST ['password']; if (empty ($ UserName) | empty ($ password) {Go_Msg ("Enter the user name and password! ",".. /Default.html "); exit;} DBConn (); $ password = md5 ($ password); $ SQL =" Select UserName, UserType, UserPass From siteuser where UserName = '". $ username. "'and UserPass = '". $ password. "'and isopen = 1"; // echo "$ SQL"; $ result = $ db-> exec_ SQL ($ SQL); $ total = mysql_num_rows ($ result ); if ($ total = 0) {DBClose (); Go_Msg ("the registered user has not passed the administrator review or the user name and password do not match! Enter again! ",".. /Default.html "); exit;} else {$ Rs = $ db-> fetch_array ($ result); // add a value and log on to session_register (" username "); session_register ("usertype"); $ _ SESSION ["usertype"] = $ Rs ['usertype']; $ _ SESSION ["username"] = $ username; // echo $ _ SESSION ["username"]; if ($ _ SESSION ["usertype"] = 1) {Go_Msg ("login successful! "," Default. php "); // header ('Location: http://163.com ');} If ($ _ SESSION ["usertype"] = 2) {Go_Msg ("login successful! "," ../User2/default_1.php ");} if ($ _ SESSION [" usertype "] = 3) {Go_Msg (" login successful! "," ../User3/default_2.php ");} // header ('Location: default. php');} DBClose (); // why do I ask hovertree.com?>

The above is all the content of this article. I hope it will help you learn PHP programming.