A simple php user login module

登陆系统


    session_start();
    if ($_SESSION[username]) {
    ?>

                                                                         
 
当前用户 
 
 
 
注销

        }else {
    ?>

                                                                                                               
 
用户 
 
             
           
 
 
密码

        }
    ?>

2，config.php

    $dbhost="localhost";
    $dbuser="root";
    $dbpassword="123456";
    $dbname="auth";
    $conn=mysql_connect("$dbhost","$dbuser","$dbpassword") or die('不能连接服务器'.mysql_error());
    mysql_select_db("$dbname",$conn) or die("数据库访问错误".mysql_errno());
    mysql_query("set names gb2312");
?>

3，userlogin.php

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    session_start();
    require("config.auth.php");
    if ($_POST[submit]) {
        $sql="select * from userinfo where username = '$_POST[username]' and password = '$_POST[password]'";
        $result=mysql_query($sql);
        $numrows=mysql_num_rows($result);
        if ($numrows == 1) {
            $row=mysql_fetch_assoc($result);
            $_SESSION[username]=$row[username];
            //echo $_SESSION[username];
            echo "<script>alert('登陆成功！');window.location.href='left.php';</script>";
        }else {
            echo "How to use cURL to implement Get and Post requests in PHPHow to use cURL to implement Get and Post requests in PHPHow to use cURL to implement Get and Post requests in PHPHow to use cURL to implement Get and Post requests in PHPAll expression symbols in regular expressions (summary)

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