用PHP编写登陆界面
网页的编写用PHP最方便。用php做了最简单的用户登录、创建的程序。
一、 MySQL的设计
MySQL设计了两个表:members和sex。两张表的创建语句分别是:
create table members (id int(4) NOT NULL auto_increment, username varchar(65) NOT NULL default '', password varchar(65) NOT NULL default '', PRIMARY KEY (id));
后有增加了几个字段:
alter table members add firstname varchar(65); alter table members add lastname varchar(65); alter table members add email varchar(65); alter table members add age varchar(65); alter table members add sex_id int; alter table members modify sex_id int(4); alter table members modify age int(4);
第二张表的创建语句:
create table sex (sex_id int primary key not null, sex varchar(20));
两张表的结构如下:
mysql> desc members; +-----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+-------------+------+-----+---------+----------------+ | id | int(4) | NO | PRI | NULL | auto_increment | | username | varchar(65) | NO | | | | | password | varchar(65) | NO | | | | | firstname | varchar(65) | YES | | NULL | | | lastname | varchar(65) | YES | | NULL | | | email | varchar(65) | YES | | NULL | | | age | int(4) | YES | | NULL | | | sex_id | int(4) | YES | | NULL | | +-----------+-------------+------+-----+---------+----------------+ 8 rows in set (0.00 sec) mysql> desc sex; +--------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------+-------------+------+-----+---------+-------+ | sex_id | int(11) | NO | PRI | NULL | | | sex | varchar(20) | YES | | NULL | | +--------+-------------+------+-----+---------+-------+ 2 rows in set (0.00 sec)
二、php页面的编写
1 index.html
Index.html是用户的登录页面主要是html的编写:
<form name="form1" method="post" action="login.php"> 用户登录<br> Username: <input name="username" type="text" id="username"><br> Password: <input name="password" type="password" id="password"><br> <input name="submit" type="submit" value="Login"> </form> <form name="form2" method="post" action="reg.html"> 用户注册<br> <input name="reg" type="submit" value="Reg"> </form>
具体的页面如下:
2 用户登录login.php
用户填写了用户名和密码后的登录和认证程序如下:
<?php include('conn.php'); $username = $_POST['username']; $password = $_POST['password']; $sql = "select * from members where username = '$username' and password = MD5('$password')"; $user_query = mysql_query($sql,$conn) or die('mysql query error'); $rows=mysql_num_rows($user_query); //print_r(mysql_fetch_row($user_query)); if($_GET['action'] == "logout"){ session_start(); unset($_SESSION['username']); //session_unset('username'); //session_destroy('username'); echo '注销登录成功!'; echo $_SESSION['username'],$username; exit; } if ($rows == 1){ session_start(); $_SESSION['username'] = $username; 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 { echo '用户名密码错误,点击此处 <a href="index.html">login</a> 登录!<br />'; } ?>
登录后的页面如下:
3 mysql的连接程序
在2中有一段conn.php,是与mysql的连接程序。具体内容如下:
<?php $mysrv="localhost"; //数据库服务器名称 $myuser="root"; // 连接数据库用户名 $mypwd=""; // 连接数据库密码 $mydb='hengwei'; $conn = mysql_connect($mysrv,$myuser,$mypwd) or die("数据库链接错 误".mysql_error()); mysql_select_db($mydb,$conn) or die("数据库访问错误".mysql_error()); ?>
4 用户页面my.php
用户登录后,可以显示自己的个人主页,其具体内容如下:
<?php session_start(); //检测是否登录,若没登录则转向登录界面 if(!isset($_SESSION['username'])){ echo '您还没有登录,请登录','<br>','<a href="index.html">login</a> 登录<br />'; exit(); } $username = $_SESSION['username']; include('conn.php'); $regsql = "select * from members join sex on username='$username' and members.sex_id=sex.sex_id"; $user_query = mysql_query($regsql,$conn) or die('mysql query error'); while($row = mysql_fetch_array($user_query)){ echo '用户名:',$row[username],'<br />'; echo '名:',$row[firstname],'<br />'; echo '姓:',$row[lastname],'<br />'; echo '年龄:',$row[age],'<br />'; echo 'Email:',$row[email],'<br />'; echo '性别:',$row[sex],'<br />'; } echo '<a href="login.php?action=logout">注销</a> 登录<br />'; ?>
页面显示如下内容:
5 用户注册页面
用户的注册页面和登录页面类似,是html的,具体内容如下:
<form name = "reg1" method = "post" action = "reg.php"> 用户注册<br> Username: <input name="reguser" type="text" id="reguser"><br> Password: <input name="regpwd" type="password" id="regpwd"><br> First Name: <input name="regfn" type="text" id="regfn"><br> Last Name: <input name="regln" type="text" id="regln"><br> Email: <input name="regemail" type="text" id="regemail"><br> Age: <input name="regage" type="text" id="regage"><br> Sex <input name="regsex" type="text" id="regsex"><br> <input name="OK" type="submit" value="OK"> </form>
页面显示如下:
6 用户注册程序
用户注册程序内容如下:
<?php include('conn.php'); $reguser = $_POST['reguser']; $regpwd = $_POST['regpwd']; $regfn = $_POST['regfn']; $regln = $_POST['regln']; $regemail = $_POST['regemail']; $regage = $_POST['regage']; $regsex = $_POST['regsex']; $regsql = "insert into members (username,password,firstname,lastname,email,age,sex_id) values ('$reguser',MD5('$regpwd'),'$regfn','$regln','$regemail','$regage',(select sex_id from sex where sex='$regsex'))"; $user_query = mysql_query($regsql,$conn) or die('mysql query error'); echo $reguser,"注册成功","<br>"; echo '返回登录页面<a href="index.html">login</a>'; mysql_close($conn); ?>
具体的页面显示如下:
三、总结
用php+mysql实现用户认证的程序相当比较简单。但程序中需要主要session的控制。在需要保持session或unset session时,都需要session_start()。
总共6个程序组成了这个登录的逻辑:
[root@hwwaf02 au]# ll total 24 -rw-r--r--. 1 root root 323 Jun 23 00:17 conn.php -rw-r--r--. 1 root root 385 Jun 20 14:09 index.html -rw-r--r--. 1 root root 963 Jun 23 00:13 login.php -rw-r--r--. 1 root root 857 Jun 22 23:38 my.php -rw-r--r--. 1 root root 543 Jun 22 23:16 reg.html -rw-r--r--. 1 root root 630 Jun 22 23:42 reg.php