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>
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='{$uid}'"; //通过用户名，判断密码$attr = $db->Query($sql);$mm = $attr[0][0]; //取出密码if(!empty($pwd) && $pwd==$mm)
{ $_SESSION["uid"] = $uid; //如果登录成功，把取到的用户名放到session保存，跳转到主页面 header("location:main.php");
}else{ echo "登录失败!";
}
3.主页面
</head>
<?phpsession_start();if(empty($_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();$sql = "select name from users where uid='{$uid}'";$attr = $db->Query($sql);?>
<body>
<?phpecho "<h1>欢迎登录：{$attr[0][0]}</h1>";?>
三、做购物车
1.调水果表的信息
<body>
<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
<td>名称</td>
<td>价格</td>
<td>产地</td>
<td>库存</td>
<td>操作</td>
</tr>
<?phpinclude("DBDA.class.php");$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>{$v[4]}</td>
<td><a href='jia.php?code={$v[0]}'>加购物车</a></td> //添加购物车选项
</tr>";
}?>
</table>
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
<? = ["code"((["gwc" = (,1["gwc"] = = ["gwc"(PanDuan(, (=0;<();++( == [][0[][1]++["gwc"]= = (,1[] = ["gwc"]=(["gwc" PanDuan(, = 0( ( == [0++(==0
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