前端小白之每天学习记录----php（7）session与cookie
服务器端的会话技术(通讯协议)
坐地铁:
深圳通
拿手机刷
cookie( 保存在 客户端的浏览器里面的数据 )
session( 保存在 web服务器里面的数据 )
如何使用cookie?
1.设置/注销cookie（新建cookie.php）
<?php
/*
array( 'user' => 'ghostwu' )
*/
// function setCookie(c_name,value,expiredays)
// 变量名，值，过期天数
setcookie( "user", "zhangsan" );//设置成功
if( isset( $_GET['act'] ) && $_GET['act'] == 'logout'){
//time(): 获取到当前的时间戳
setcookie( "user", "", time() - 1 );//清空user的值，并使它过期
}
?>
<a href="?act=logout">注销</a>
2.取出cookie（新建cookie2.php）
<?php
/*
php里面的所有cookie都是存储在超级全局变量 $_COOKIE 里面
$_COOKIE是储存在浏览器的类数组
*/
// print_r( $_COOKIE );
// echo $_COOKIE['user'];
if( !empty( $_COOKIE['user'] ) ){
echo $_COOKIE['user'];
}
?>
3.一个设置cookie的登录页面（新建login.php）
登录成功时候用cookie保存用户名与密码
setcookie( "name", $userName ); /
setcookie( "pwd", $userPwd );
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<style>
.reg-form {
margin-top: 100px;
}
</style>
</head>
<body>
<!-- 链接数据库 -->
<?php
require( './mysql.class.php' );//链接数据库的类文件，请参考本系列上一节
?>
<!-- html文本 -->
<div class="container">
<div class="row">
<div class="tip"></div>
<form class="form-horizontal reg-form" role="form" method="post">
<div class="form-group">
<label for="firstname" class="col-md-2 control-label">用户名:</label>
<div class="col-md-6">
<input type="text" class="form-control" id="user" name="user" placeholder="请输入用户名">
</div>
</div>
<div class="form-group">
<label for="lastname" class="col-md-2 control-label">密码</label>
<div class="col-md-6">
<input type="password" name="pwd" class="form-control" id="pwd" placeholder="请输入密码">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-primary">登录</button>
</div>
</div>
</form>
</div>
</div>
<!-- PHP文本 -->
<?php
if( !empty( $_POST['user'] ) && !empty( $_POST['pwd'] ) ){ //判断用户名密码非空
$userName = $_POST['user'];
$userPwd = $_POST['pwd'];
$sql = "SELECT * FROM user_info WHERE user_name = '$userName' AND user_pwd = '$userPwd'";
$res = mysql_query( $sql ); //查询用户名密码
if( $res && mysql_num_rows( $res ) ){ //如果查询成功，并且账号密码正确
setcookie( "name", $userName ); //设置cookie
setcookie( "pwd", $userPwd );
header("Location:success.php"); //设置完跳转到success.php页面
?>
<!-- <script>
window.location.href = './success.html';
</script> -->
<?php
}else { //登录不成功，重新加载页面
header("Location:login.php");
?>
<!-- <script>
window.location.href = './error.html';
</script> -->
<?php
}
}
?>
</body>
</html>
4.使用保存的cookie --->登录成功页面（新建success.php）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<?php
if( empty( $_COOKIE['name'] ) ){ //是否有用户名
header("Location:login.php"); // 没有用户名则跳到登录页面
}
//这里要添加一条判断 数据库查询用户名与密码是否正确
//判断方法与登录页面相同，如果用户名密码错误，跳去登录页面
//点击注销页面：使cookie过期
if( isset( $_GET['act'] ) && $_GET['act'] == 'logout' ){
setcookie( 'name', '', time() - 1 ); //注销cookie
header("Location:login.php"); //注销后跳转到登录页面
}
?>
<h3>欢迎您
<!-- 把cookie保存的用户名取出来 -->
<?php echo !empty($_COOKIE['name']) ? $_COOKIE['name'] : ''; ?>
!登录</h3> |
<!-- 注销按钮 -->
<a href="?act=logout">注销</a>
</body>
</html>
如何使用session?
1.设置/注销session（新建session.php）
<?php
/*
要使用session, 必须先要用session_start() 开启session
web服务器上会创建一个类数组$_SESSION
*/
session_start();
$_SESSION['name'] = 'zhangsan';
if( isset( $_GET['act'] ) && $_GET['act'] == 'logout' ){
//删除某个数组的一项，或者删除一个变量
unset( $_SESSION['name'] );
}
?>
<a href="?act=logout">注销</a>
2.取出session（新建session2.php）
<?php
session_start();
if( !empty( $_SESSION['name'] ) ){
echo $_SESSION['name'];
}
?>
3.一个设置session的登录页面（新建login2.php）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<style>
.reg-form {
margin-top: 100px;
}
</style>
</head>
<body>
<?php
session_start();
require( './mysql.class.php' );
?>
<div class="container">
<div class="row">
<div class="tip"></div>
<form class="form-horizontal reg-form" role="form" method="post">
<div class="form-group">
<label for="firstname" class="col-md-2 control-label">用户名:</label>
<div class="col-md-6">
<input type="text" class="form-control" id="user" name="user" placeholder="请输入用户名">
</div>
</div>
<div class="form-group">
<label for="lastname" class="col-md-2 control-label">密码</label>
<div class="col-md-6">
<input type="password" name="pwd" class="form-control" id="pwd" placeholder="请输入密码">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-primary">登录</button>
</div>
</div>
</form>
</div>
</div>
<?php
if( !empty( $_POST['user'] ) && !empty( $_POST['pwd'] ) ){
$userName = $_POST['user'];
$userPwd = $_POST['pwd'];
$sql = "SELECT * FROM user_info WHERE user_name = '$userName' AND user_pwd = '$userPwd'";
$res = mysql_query( $sql );
if( $res && mysql_num_rows( $res ) ){
$_SESSION['name'] = $userName;
$_SESSION['pwd'] = $userPwd;
header("Location:success2.php");
?>
<!-- <script>
window.location.href = './success.html';
</script> -->
<?php
}else {
header("Location:login2.php");
?>
<!-- <script>
window.location.href = './error.html';
</script> -->
<?php
}
}
?>
</body>
</html>
4.使用保存的session --->登录成功页面（新建succeed2.php）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<?php
session_start(); //开启session
require("./mysql.class.php");//链接数据库的类文件，请参考本系列上一节
?>
<?php
if( empty( $_SESSION['name'] ) ){//判断用户名是否为空
header("Location:login2.php");
}
else if ( !empty( $_SESSION['name'] ) ){//用户名非空
$sql = "SELECT * FROM user_info WHERE user_name = '{$_SESSION['name']}' AND user_pwd = '{$_SESSION['pwd']}'";
$res = $mysql->query( $sql );
if( !( $res && mysql_num_rows( $res ) ) ){//用户名密码正确
header("Location:login2.php");
}
}
if( isset( $_GET['act'] ) && $_GET['act'] == 'logout' ){//是否注销
unset( $_SESSION['name'] ); //移除用户名
header("Location:login2.php");
}
?>
<h3>欢迎您<?php echo !empty( $_SESSION['name'] ) ? $_SESSION['name'] : ''; ?>! 登录会员中心</h3>
<a href="?act=logout">注销</a>
</body>
</html>
5.在注册页面注册成功的时候保存session --->注册页面（新建reg.php）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<style>
.reg-form {
margin-top: 100px;
}
</style>
</head>
<body>
<?php
session_start();
require( './mysql.class.php' );
?>
<div class="container">
<div class="row">
<div class="tip"></div>
<form class="form-horizontal reg-form" role="form" method="post">
<div class="form-group">
<label for="firstname" class="col-md-2 control-label">用户名:</label>
<div class="col-md-6">
<input type="text" class="form-control" id="user" name="user" placeholder="请输入用户名">
</div>
</div>
<div class="form-group">
<label for="lastname" class="col-md-2 control-label">密码</label>
<div class="col-md-6">
<input type="password" name="pwd" class="form-control" id="pwd" placeholder="请输入密码">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-primary">注册</button>
</div>
</div>
</form>
</div>
</div>
<?php
if( !empty( $_POST['user'] ) && !empty( $_POST['pwd'] ) ){
$userName = $_POST['user'];
$userPwd = $_POST['pwd'];
$sql = 'SELECT * FROM user_info WHERE user_name = "' . $userName . '"';
$res = mysql_query( $sql );
if( $res && mysql_num_rows( $res ) ){ //用户名存在
?>
<script>
document.querySelector(".tip").innerHTML = '你输入的用户名已经存在';
</script>
<?php
}else { //用户名， 开始注册了
$sql = "INSERT INTO user_info ( user_name, user_pwd ) VALUES( '$userName', '$userPwd' )";
$res = mysql_query( $sql );
if( $res !== false ){
$_SESSION['name'] = $userName;
$_SESSION['pwd'] = $userPwd;
?>
<script>
document.querySelector(".tip").innerHTML = '用户名注册成功';
</script>
<?php
}else {
?>
<script>
document.querySelector(".tip").innerHTML = '用户名注册失败';
</script>
<?php
}
}
}
?>
</body>
</html>
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