以下列出了用户注册与登录的完整代码,您也可以 点击此处 下载本节教程完整的源代码压缩包。
login.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gbk" /> <title>用户登录</title> <style type="text/css"> html{font-size:12px;} fieldset{width:520px; margin: 0 auto;} legend{font-weight:bold; font-size:14px;} label{float:left; width:70px; margin-left:10px;} .left{margin-left:80px;} .input{width:150px;} span{color: #666666;} </style> <script language=JavaScript> <!-- function InputCheck(LoginForm) { if (LoginForm.username.value == "") { alert("请输入用户名!"); LoginForm.username.focus(); return (false); } if (LoginForm.password.value == "") { alert("请输入密码!"); LoginForm.password.focus(); return (false); } } //--> </script> </head> <body> <div> <fieldset> <legend>用户登录</legend> <form name="LoginForm" method="post" action="login.php" onSubmit="return InputCheck(this)"> <p> <label for="username" class="label">用户名:</label> <input id="username" name="username" type="text" class="input" /> <p/> <p> <label for="password" class="label">密 码:</label> <input id="password" name="password" type="password" class="input" /> <p/> <p> <input type="submit" name="submit" value=" 确 定 " class="left" /> </p> </form> </fieldset> </div> </body> </html>
conn.php
<?php /***************************** *数据库连接 *****************************/ $conn = @mysql_connect("localhost","root","root123"); if (!$conn){ die("连接数据库失败:" . mysql_error()); } mysql_select_db("test", $conn); //字符转换,读库 mysql_query("set character set 'gbk'"); //写库 mysql_query("set names 'gbk'"); ?>
reg.php
<?php if(!isset($_POST['submit'])){ exit('非法访问!'); } $username = $_POST['username']; $password = $_POST['password']; $email = $_POST['email']; //注册信息判断 if(!preg_match('/^[\w\x80-\xff]{3,15}$/', $username)){ exit('错误:用户名不符合规定。<a href="javascript:history.back(-1);">返回</a>'); } if(strlen($password) < 6){ exit('错误:密码长度不符合规定。<a href="javascript:history.back(-1);">返回</a>'); } if(!preg_match('/^w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*$/', $email)){ exit('错误:电子邮箱格式错误。<a href="javascript:history.back(-1);">返回</a>'); } //包含数据库连接文件 include('conn.php'); //检测用户名是否已经存在 $check_query = mysql_query("select uid from user where username='$username' limit 1"); if(mysql_fetch_array($check_query)){ echo '错误:用户名 ',$username,' 已存在。<a href="javascript:history.back(-1);">返回</a>'; exit; } //写入数据 $password = MD5($password); $regdate = time(); $sql = "INSERT INTO user(username,password,email,regdate)VALUES('$username','$password','$email', $regdate)"; if(mysql_query($sql,$conn)){ exit('用户注册成功!点击此处 <a href="login.html">登录</a>'); } else { echo '抱歉!添加数据失败:',mysql_error(),'<br />'; echo '点击此处 <a href="javascript:history.back(-1);">返回</a> 重试'; } ?>
login.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gbk" /> <title>用户登录</title> <style type="text/css"> html{font-size:12px;} fieldset{width:300px; margin: 0 auto;} legend{font-weight:bold; font-size:14px;} .label{float:left; width:70px; margin-left:10px;} .left{margin-left:80px;} .input{width:150px;} span{color: #666666;} </style> <script language=JavaScript> <!-- function InputCheck(LoginForm) { if (LoginForm.username.value == "") { alert("请输入用户名!"); LoginForm.username.focus(); return (false); } if (LoginForm.password.value == "") { alert("请输入密码!"); LoginForm.password.focus(); return (false); } } //--> </script> </head> <body> <div> <fieldset> <legend>用户登录</legend> <form name="LoginForm" method="post" action="login.php" onSubmit="return InputCheck(this)"> <p> <label for="username" class="label">用户名:</label> <input id="username" name="username" type="text" class="input" /> <p/> <p> <label for="password" class="label">密 码:</label> <input id="password" name="password" type="password" class="input" /> <p/> <p> <input type="submit" name="submit" value=" 确 定 " class="left" /> </p> </form> </fieldset> </div> </body> </html>
login.php
<?php session_start(); //注销登录 if($_GET['action'] == "logout"){ unset($_SESSION['userid']); unset($_SESSION['username']); echo '注销登录成功!点击此处 <a href="login.html">登录</a>'; exit; } //登录 if(!isset($_POST['submit'])){ exit('非法访问!'); } $username = htmlspecialchars($_POST['username']); $password = MD5($_POST['password']); //包含数据库连接文件 include('conn.php'); //检测用户名及密码是否正确 $check_query = mysql_query("select uid from user where username='$username' and password='$password' limit 1"); if($result = mysql_fetch_array($check_query)){ //登录成功 $_SESSION['username'] = $username; $_SESSION['userid'] = $result['uid']; echo $username,' 欢迎你!进入 <a href="my.php">用户中心</a><br />'; echo '点击此处 <a href="login.php?action=logout">注销</a> 登录!<br />'; exit; } else { exit('登录失败!点击此处 <a href="javascript:history.back(-1);">返回</a> 重试'); } ?>
my.php
<?php session_start(); //检测是否登录,若没登录则转向登录界面 if(!isset($_SESSION['userid'])){ header("Location:login.html"); exit(); } //包含数据库连接文件 include('conn.php'); $userid = $_SESSION['userid']; $username = $_SESSION['username']; $user_query = mysql_query("select * from user where uid=$userid limit 1"); $row = mysql_fetch_array($user_query); echo '用户信息:<br />'; echo '用户ID:',$userid,'<br />'; echo '用户名:',$username,'<br />'; echo '邮箱:',$row['email'],'<br />'; echo '注册日期:',date("Y-m-d", $row['regdate']),'<br />'; echo '<a href="login.php?action=logout">注销</a> 登录<br />'; ?>