PHP session

 

<?php
session_start();//开启session

//HTTP,无状态性
//SESSION COOKIE

SESSION：存储在服务端的，每个人存一份，可以存储任意类型的数据，默认过期时间15分钟
COOKIE：存储在客户端的，每个人存一份，只能存储字符串，默认永不过期

$_SESSION["uid"] = "zhangsan";//写入SESSION

echo $_SESSION["uid"];

setcookie("uid","zhangsan"); //设置COOKIE

?>
会话购物车，练习

login页面

<h1>登录</h1>
<form action="loginchuli.php" method="post">
    <div>用户名：<input type="text" name="uid" /></div>
    <div>密码：<input type="text" name="pwd" /></div>
    <div><input type="submit" value="登录" /></div>
</form>

loginchuli页面

<?php
session_start();----开启session
include("../DBDA.php");
$db = new DBDA();

$uid = $_POST["uid"];
$pwd = $_POST["pwd"];

$sql = "select count(*) from Users where Uid='{$uid}' and Pwd = '{$pwd}'";

$r = $db->StrQuery($sql);

if($r==1)
{
    $_SESSION["uid"] = $uid;
    header("location:main.php");
}
else
{
    header("location:login.php");
}

main页面

 

<body>
<?php
session_start();

if(empty($_SESSION["uid"]))
{
    header("location:login.php");
}


echo $_SESSION["uid"];
?>
</body>

 

showlist页面

 

 

<body>
<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
    <td>水果名称</td>
    <td>水果价格</td>
    <td>水果产地</td>
    <td>水果库存</td>
    <td>操作</td>
</tr>
<?php

include("../DBDA.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>{$v[4]}</td>
    <td><a href='addgwc.php?code={$v[0]}'>加入购物车</a></td></tr>";
}

?>
</table>

<a href="gouwuche.php">查看购物车</a>
</body>

 

addgwc页面

<?php
session_start();

$code = $_GET["code"];


//如果第一次点击
if(empty($_SESSION["sg"]))
{
    $attr = array(array($code,1));
    $_SESSION["sg"] = $attr;
}
else
{
    //第n次点击，n!=1
    $attr = $_SESSION["sg"];
    
    //判断该水果师是否已经存在
    if(iscunzai($code))
    {
        foreach($attr as $k=>$v)
        {
            if($v[0]==$code)
            {
                $attr[$k][1] = $v[1]+1;
            }
        }
        
        $_SESSION["sg"] = $attr;
    }
    else
    {
        $arr = array($code,1);
        array_push($attr,$arr);
        
        $_SESSION["sg"] = $attr;
    }

}

function iscunzai($c)
{
    $attr = $_SESSION["sg"];
    
    $b = false;
    
    foreach($attr as $v)
    {
        $b = $b || in_array($c,$v);
    }
    
    return $b;
}

header("location:showlist.php");

gouwuche页面

<body>
<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
    <td>水果名称</td>
    <td>水果价格</td>
    <td>数量</td>
</tr>
<?php
session_start();

include("../DBDA.php");
$db = new DBDA();

$attr = $_SESSION["sg"];

foreach($attr as $v)
{
    $sql = "select Name,Price from fruit where Ids='{$v[0]}'";
    
    $arr = $db->Query($sql);
    
    echo "<tr><td>{$arr[0][0]}</td>
    <td>{$arr[0][1]}</td>
    <td>{$v[1]}</td></tr>";
}


?>
</table>
</body>

 

posted @ 2016-05-28 22:00  翟喵儿  阅读(196)  评论(0)  编辑  收藏  举报