PHP实现用户登录页面
<p>PHP学习日常，放在上面记录一下咯<br>我用了bootstrap框架，这样的界面要好看一点<br>
登录页面：<br>
<img src="https://upload-images.jianshu.io/upload_images/17943987-4742175ad26bd103.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"><br>
必须用户名、密码、验证码都输入正确才能登录成功喔，否则出现下面提示<br>
<img src="https://upload-images.jianshu.io/upload_images/17943987-0361ce39d569fd04.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"><br>
<img src="https://upload-images.jianshu.io/upload_images/17943987-f83fc575f310e146.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"><br>
登陆成功之后，登录和注册选项切换为用户昵称和注销选项：<br>
<img src="https://upload-images.jianshu.io/upload_images/17943987-2f83a79d67e9afa3.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"><br>
登陆成功之后：<br>
<img src="//upload-images.jianshu.io/upload_images/17943987-4ebf43850401fff1.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"><br>
选择注销：<br>
<img src="//upload-images.jianshu.io/upload_images/17943987-29f65c9ebb36a5ee.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"> <img src="//upload-images.jianshu.io/upload_images/17943987-65c0e20b389b0c13.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"><br>
HTML代码：</p>
<pre><code><link rel="stylesheet" href="css/bootstrap.css">
<style>
li.toggle{
display: block;
}
li.toggle1{
display: none;
}
</style>
<li class="toggle"><a data-toggle="modal" href="#loginer">登录</a></li>
<li class="toggle"><a data-toggle="modal" href="#register">注册</a></li>
<li class="toggle1"><a id="nicheng" href="##"></a></li>
<li class="toggle1"><a id="logout" href="##">注销</a></li>
//模态框
<div id="loginer" class="modal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel1"
aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">
<span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
<h4 class="modal-title">请登录</h4>
</div>
<form id="form_login" class="form-horizontal">
<div class="modal-body">
<div class="form-group has-feedback">
<label class="col-sm-3 control-label" for="zh1">用户名：</label>
<div class="col-sm-9 require">
<input type="text" class="form-control" name="username" id="zh1"
pattern="\w{6,10}" required>
</div>
</div>
<div class="form-group has-feedback">
<label class="col-sm-3 control-label" for="pw1">密码：</label>
<div class="col-sm-9 require">
<input type="password" pattern="\w{6,10}" class="form-control" name="pwd" id="pw1"
required>
</div>
</div>
<div class="form-group has-feedback">
<label class="col-sm-3 control-label" for="yzm">验证码：</label>
<div class="col-sm-5 require">
<input type="text" pattern="\d{4}" class="form-control" name="yzm" id="yzm"
required>
</div>
<div class="col-sm-4">
<img src="php/idcode.php" alt="">
</div>
</div>
<div class="form-group has-feedback">
<label id="info" class="col-sm-4 control-label pull-left"></label>
</div>
</div>
<div class="modal-footer">
<button type="submit" class="btn btn-primary">登录</button>
<button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
</div>
</form>
</div>
</div>
</div>
</code></pre>
<p>JS代码：</p>
<pre><code><script src="js/jquery-2.1.3.js"></script>
<script src="js/bootstrap.min.js"></script>
<script>
function toggle(){
$.getJSON("php/get.php",function (res) {
if(res['flag']){
$('li.toggle').hide();
$('li.toggle1').show();
$('#nicheng').html(res['nc'])
}else {
$('li.toggle').show();
$('li.toggle1').hide();
}
});
}
toggle();
$('#form_login').submit(function (e) {
e.preventDefault();
var data=$('#form_login').serialize();
$.getJSON('php/login.php',data,function (res) {
if(res==3){
toggle();
$('#loginer').modal('hide');
}else if(res==2){
$('#info').html('用户名或密码有误')
}else {
$('#info').html('验证码有误')
}
})
});
$('#logout').click(function () {
confirm('确定要注销？');
$.getJSON('php/logout.php',function (res) {
if(res)toggle();
})
})
</script>
</code></pre>
<p>connect.php(连接数据库)：</p>
<pre><code><?php
$link=new PDO("mysql:host=localhost;port=3306;dbname=db","root","");
$link->query("set names utf8");
</code></pre>
<p>get.php(获取用户登录信息):</p>
<pre><code><?php
include_once ("connect.php");
session_start();/*开启会话*/
if (isset($_SESSION['username'])){
/* 判断用户会话里用户名是否存在，即用户是否登录*/
$json['nc']=$_SESSION['nc'];/*把昵称存起来，一会返回给首页*/
$json['flag']=true;/*用户已经登录，标志flag为true*/
}else
$json['flag']=false;/*用户已经登录，标志flag为true*/
echo json_encode($json);/*返回json*/
</code></pre>
<p>login.php（登录）：</p>
<pre><code><?php
include_once ("connect.php");
session_start();/*开启会话*/
$user=$_GET['username'];/*获取登录表单提交过来的数据*/
$pwd=$_GET['pwd'];
$yzm=$_GET['yzm'];
if($yzm==$_SESSION['vCode']){/*当用户输入的验证码和图片验证码相同时*/
$result=$link->query("select * from `user` where username='$user' and pwd='$pwd'");
$link = null;
$row = $result->fetch();/*读取从数据库获取的数据*/
if ($row) {/*如果数据存在，即用户登录成功*/
$_SESSION['username'] = $row['username'];
/*将用户名和昵称存在服务器，可以多个页面使用*/
$_SESSION['nc'] = $row['nc'];
$flag=3;
}else{/*用户名或密码错误*/
$flag=2;
}
}else{/*验证码输入错误*/
$flag=1;
}
echo $flag;
</code></pre>
<p>logout.php(注销)：</p>
<pre><code><?php
session_start();
unset($_SESSION['username']);//销毁用户名
unset($_SESSION['nc']);//销毁昵称
echo json_encode(true);//返回结果
</code></pre>
<p>上面登录页面的验证码在我的另一篇文里面，需要的小伙伴可以看一下：<br>
https://www.jianshu.com/p/7473f5bdd9c0</p><br><br>
来源：https://www.cnblogs.com/xyyl/p/10931702.html
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