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实例详解php中session的三种用法

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Release: 2018-10-24 13:55:38
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这篇文章主要介绍了php中session的三种用法,有一定参考价值,感兴趣的朋友可以看看,希望对你有所帮助!

一.在不同页面之间显示用户的信息

二.控制登录

1.登录页面

<body>
<form action="loginchuli.php" method="post">
    <p>用户名:<input type="text" name="uid" /></p>
    <p>密码:<input type="password" name="pwd" /></p>
    <input type="submit" value="登录" />
</form>
</body>
</html>
Copy after login

2.登录处理页面

<?phpsession_start();include("DBDA.class.php");$db = new DBDA();$uid = $_POST["uid"];$pwd = $_POST["pwd"];$sql = "select pwd from users where uid=&#39;{$uid}&#39;";    //通过用户名,判断密码$attr = $db->Query($sql);$mm = $attr[0][0];                                    //取出密码if(!empty($pwd) && $pwd==$mm)
{    $_SESSION["uid"] = $uid;                         //如果登录成功,把取到的用户名放到session保存,跳转到主页面    header("location:main.php");     
}else{    echo "登录失败!";
}
Copy after login

3.主页面

</head>
<?phpsession_start();if(empty($_SESSION["uid"]))               //判断session里面是不是存储到值,如果没有存储,让其跳转到登录界面
{    header("location:login.php");    exit;
}$uid = $_SESSION["uid"];                    //如果能够取到,通过session取到的用户名,显示下面的信息include("DBDA.class.php");$db = new DBDA();$sql = "select name from users where uid=&#39;{$uid}&#39;";$attr = $db->Query($sql);?>
<body>
<?phpecho "<h1>欢迎登录:{$attr[0][0]}</h1>";?>
Copy after login

三、做购物车

1.调水果表的信息

<body>
<table width="100%" border="1" cellpadding="0" cellspacing="0">
    <tr>
        <td>名称</td>
        <td>价格</td>
        <td>产地</td>
        <td>库存</td>
        <td>操作</td>
    </tr>
<?phpinclude("DBDA.class.php");$db = new DBDA();$sql = "select * from fruit";$attr = $db->Query($sql);foreach($attr as $v)
{    echo "<tr>
        <td>{$v[1]}</td>
        <td>{$v[2]}</td>
        <td>{$v[3]}</td>
        <td>{$v[4]}</td>
        <td><a href=&#39;jia.php?code={$v[0]}&#39;>加购物车</a></td>    //添加购物车选项
    </tr>";
}?>
</table>
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2.将传过来的水果加到购物车

三条思路:

//1.如果是第一次点击加购物车,做一个二维数组扔到SESSION里

//2.如果不是第一次点击加购物车并且该水果第一次点击,做一个该水果的一维数组扔到SESSION的二维数组里面

//3.如果不是第一次点击加购物车并且该水果不是第一次点击,将SESSION数组里面该水果的数量加1
Copy after login
<? = ["code"((["gwc"
     = (,1["gwc"] = 
     = ["gwc"(PanDuan(,
        
        (=0;<();++( == [][0[][1]++["gwc"]=
         = (,1[] = ["gwc"]=(["gwc" PanDuan(, = 0(  ( == [0++(==0
Copy after login

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source:cnblogs.com
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