1.基本流程：
2.UML类图：
立即学习“PHP免费学习笔记（深入）”；
3.PHP代码：
3.1 index.php
<?<span style="color: #000000;">php
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* Created by PhpStorm.
* User: andy
* Date: 16-11-25
* Time: 下午10:13
</span><span style="color: #008000;">*/</span>
<span style="color: #008080;">session_start</span><span style="color: #000000;">();
</span><span style="color: #800080;">$validate_username</span>=<span style="color: #0000ff;">isset</span>(<span style="color: #800080;">$_SESSION</span>['validate_username'])?<span style="color: #800080;">$_SESSION</span>['validate_username']:''<span style="color: #000000;">;
</span><span style="color: #800080;">$validate_password</span>=<span style="color: #0000ff;">isset</span>(<span style="color: #800080;">$_SESSION</span>['validate_password'])?<span style="color: #800080;">$_SESSION</span>['validate_password']:''<span style="color: #000000;">;
</span>?>
<html>
<head>
<meta charset="utf-8"/>
<title>用户登录</title>
</head>
<body>
<h1>用户登录</h1>
<form action="login.php" method="post"><span style="color: #000000;">
用户名：</span><input type="text" name="username" value="" /><font color="red">
<?php <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$validate_username</span>; ?>
</font><br /><br /><span style="color: #000000;">
密</span> 码：<input type="password" name="password" value="" /><font color="red">
<?php <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$validate_password</span>; ?>
</font><br /><br />
<input type="submit" value="提交" />
</form>
</body>
</html>3.2 login.php
<?<span style="color: #000000;">php
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* Created by PhpStorm.
* User: andy
* Date: 16-11-25
* Time: 下午10:20
</span><span style="color: #008000;">*/</span>
<span style="color: #008080;">session_start</span><span style="color: #000000;">();
</span><span style="color: #800080;">$username</span> = <span style="color: #800080;">$_POST</span>['username'<span style="color: #000000;">];
</span><span style="color: #800080;">$password</span> = <span style="color: #800080;">$_POST</span>['password'<span style="color: #000000;">];
</span><span style="color: #800080;">$user</span> = <span style="color: #0000ff;">new</span> User(<span style="color: #800080;">$username</span>, <span style="color: #800080;">$password</span><span style="color: #000000;">);
</span><span style="color: #008000;">//</span><span style="color: #008000;">判断登录是否成功</span>
<span style="color: #0000ff;">try</span><span style="color: #000000;">{
Validate</span>::validateUser(<span style="color: #800080;">$user</span><span style="color: #000000;">);
</span><span style="color: #008000;">//</span><span style="color: #008000;">验证通过，登录成功</span>
<span style="color: #800080;">$_SESSION</span>['username']=<span style="color: #800080;">$username</span><span style="color: #000000;">;
</span><span style="color: #008080;">header</span>('location:main.php'<span style="color: #000000;">);
}</span><span style="color: #0000ff;">catch</span> (MyException <span style="color: #800080;">$me</span><span style="color: #000000;">){
</span><span style="color: #008000;">//</span><span style="color: #008000;">验证失败</span>
<span style="color: #008080;">header</span>('location:index.php'<span style="color: #000000;">);
}
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* 自动加载类
* @param $class
* @return string
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">function</span> __autoload(<span style="color: #800080;">$class</span><span style="color: #000000;">)
{
</span><span style="color: #800080;">$file</span> = __DIR__ . '/' . <span style="color: #008080;">strtolower</span>(<span style="color: #800080;">$class</span>) . '.php'<span style="color: #000000;">;
</span><span style="color: #0000ff;">if</span> (<span style="color: #008080;">is_file</span>(<span style="color: #800080;">$file</span><span style="color: #000000;">)) {
</span><span style="color: #0000ff;">include_once</span> <span style="color: #800080;">$file</span><span style="color: #000000;">;
}
</span><span style="color: #0000ff;">return</span> ''<span style="color: #000000;">;
}</span>3.3 myexception.php
<?<span style="color: #000000;">php
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* Created by PhpStorm.
* User: andy
* Date: 16-11-25
* Time: 下午10:50
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">class</span> MyException <span style="color: #0000ff;">extends</span> <span style="color: #0000ff;">Exception</span><span style="color: #000000;">
{
}</span>3.4 user.php
<?<span style="color: #000000;">php
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* Created by PhpStorm.
* User: andy
* Date: 16-11-25
* Time: 下午10:29
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">class</span><span style="color: #000000;"> User
{
</span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$username</span> = ''<span style="color: #000000;">;
</span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$password</span> = ''<span style="color: #000000;">;
</span><span style="color: #0000ff;">function</span> __construct(<span style="color: #800080;">$username</span>, <span style="color: #800080;">$password</span><span style="color: #000000;">)
{
</span><span style="color: #800080;">$this</span>->username = <span style="color: #800080;">$username</span><span style="color: #000000;">;
</span><span style="color: #800080;">$this</span>->password = <span style="color: #800080;">$password</span><span style="color: #000000;">;
}
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* 返回用户名
* @return string
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> getUsername(): <span style="color: #0000ff;">string</span><span style="color: #000000;">
{
</span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$this</span>-><span style="color: #000000;">username;
}
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* 返回密码
* @return string
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> getPassword(): <span style="color: #0000ff;">string</span><span style="color: #000000;">
{
</span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$this</span>-><span style="color: #000000;">password;
}
}</span>3.5 validate.php
<?<span style="color: #000000;">php
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* 验证类
* Created by PhpStorm.
* User: andy
* Date: 16-11-25
* Time: 下午10:34
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">class</span><span style="color: #000000;"> Validate
{
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* 验证用户
* @param User $user
* @throws MyException
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">static</span> <span style="color: #0000ff;">function</span> validateUser(User <span style="color: #800080;">$user</span><span style="color: #000000;">)
{
</span><span style="color: #008000;">//</span><span style="color: #008000;">print_r($user);</span>
<span style="color: #800080;">$username</span> = <span style="color: #800080;">$user</span>-><span style="color: #000000;">getUsername();
</span><span style="color: #800080;">$password</span> = <span style="color: #800080;">$user</span>-><span style="color: #000000;">getPassword();
</span><span style="color: #0000ff;">unset</span>(<span style="color: #800080;">$_SESSION</span>['validate_username'],<span style="color: #800080;">$_SESSION</span>['validate_password'<span style="color: #000000;">]);
</span><span style="color: #008000;">//</span><span style="color: #008000;">验证用户名</span>
<span style="color: #0000ff;">try</span><span style="color: #000000;"> {
self</span>::validateUsername(<span style="color: #800080;">$username</span><span style="color: #000000;">);
}</span><span style="color: #0000ff;">catch</span> (MyException <span style="color: #800080;">$me</span><span style="color: #000000;">) {
</span><span style="color: #800080;">$_SESSION</span>['validate_username']=<span style="color: #800080;">$me</span>-><span style="color: #000000;">getMessage();
}
</span><span style="color: #008000;">//</span><span style="color: #008000;">验证密码</span>
<span style="color: #0000ff;">try</span><span style="color: #000000;"> {
self</span>::validatePassword(<span style="color: #800080;">$password</span><span style="color: #000000;">);
}</span><span style="color: #0000ff;">catch</span> (MyException <span style="color: #800080;">$me</span><span style="color: #000000;">) {
</span><span style="color: #800080;">$_SESSION</span>['validate_password']=<span style="color: #800080;">$me</span>-><span style="color: #000000;">getMessage();
}
</span><span style="color: #0000ff;">if</span>(<span style="color: #0000ff;">isset</span>(<span style="color: #800080;">$me</span><span style="color: #000000;">)){
</span><span style="color: #0000ff;">throw</span> <span style="color: #800080;">$me</span><span style="color: #000000;">;
}
}
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* 验证用户名
* @param $username
* @throws MyException
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">static</span> <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span> validateUsername(<span style="color: #800080;">$username</span><span style="color: #000000;">)
{
</span><span style="color: #800080;">$lem</span> = <span style="color: #008080;">strlen</span>(<span style="color: #800080;">$username</span><span style="color: #000000;">);
</span><span style="color: #0000ff;">if</span> (<span style="color: #800080;">$lem</span> < 3<span style="color: #000000;">) {
</span><span style="color: #008000;">//</span><span style="color: #008000;">抛出异常</span>
<span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> MyException('用户名长度不能小于3位', <span style="color: #ff00ff;">E_USER_ERROR</span><span style="color: #000000;">);
} </span><span style="color: #0000ff;">elseif</span> (<span style="color: #800080;">$lem</span> > 8<span style="color: #000000;">) {
</span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> MyException('用户名长度不能超过8位', <span style="color: #ff00ff;">E_USER_ERROR</span><span style="color: #000000;">);
}
}
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
* 验证密码
* @param $password
* @throws MyException
</span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">static</span> <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span> validatePassword(<span style="color: #800080;">$password</span><span style="color: #000000;">)
{
</span><span style="color: #800080;">$lem</span> = <span style="color: #008080;">strlen</span>(<span style="color: #800080;">$password</span><span style="color: #000000;">);
</span><span style="color: #0000ff;">if</span> (<span style="color: #800080;">$lem</span> < 3<span style="color: #000000;">) {
</span><span style="color: #008000;">//</span><span style="color: #008000;">抛出异常</span>
<span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> MyException('密码长度不能小于3位', <span style="color: #ff00ff;">E_USER_ERROR</span><span style="color: #000000;">);
} </span><span style="color: #0000ff;">elseif</span> (<span style="color: #800080;">$lem</span> > 8<span style="color: #000000;">) {
</span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> MyException('密码长度不能超过8位', <span style="color: #ff00ff;">E_USER_ERROR</span><span style="color: #000000;">);
}
}
}</span>
（完.）
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