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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:

技术分享

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="http://www.mamicode.com/my.php">用户中心</a><br />‘;
    echo ‘点击此处 <a href="http://www.mamicode.com/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="http://www.mamicode.com/index.html">login</a> 登录!<br />‘;
}
?>

登录后的页面如下:

技术分享

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="http://www.mamicode.com/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="http://www.mamicode.com/login.php?action=logout">注销</a> 登录<br />‘;
?>

页面显示如下内容:

技术分享

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:

技术分享

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 $reguser,"注册成功","<br>";
echo ‘返回登录页面<a href="http://www.mamicode.com/index.html">login</a>‘;
mysql_close($conn);
?>

具体的页面显示如下:

技术分享

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

 

用PHP编写登陆界面