php基础八之会话管理和控制

程序员文章站 2022-03-13 08:50:42
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<!-- 第十四章 php会话管理和控制 -->
<?php
    setcookie('name');
    setcookie('mycookie');
    setcookie('mycookie','');
    setcookie("mycookie",false);
    setcookie('mycookie','',time()-3600);
    echo ($HTTP_COOKIE_VARS['mycookie']);
    print_r($_COOKIE);
?>


<?php
if (($_POST['username'] != null) && ($_POST['password'] != null)) {
    $userName = $_POST['username'];
    $passWord =md5($_POST['password']);
    $conn = mysqli_connect('localhost', 'root', 'root');
    mysqli_select_db($conn, 'test');
    $sql = "select * from user where 'username = '$userName'";
    $res = mysqli_query($conn, $sql);
    $row = mysqli_fetch_assoc($res);
    if ($row['password'] == $passWord) {
        setcookie('username',$userName,time()+60*60*24*30);
        setcookie('password',$passWord,time()+60*60*24*30);
        header('Location: welcome.php'."?username=$userName");
    }
}
if (($_COOKIE['username'] != null) && ($_COOKIE['password'] != null)) {
    $userName = $_COOKIE['username'];
    $passWord = $_COOKIE['password'];
    $conn = mysqli_connect('localhost', 'root', 'root', 'test');
    $res = mysqli_query($conn, "select * from user where username = '$userName'");
    $row = mysqli_fetch_assoc($res);
    if ($row['password'] == $passWord) {
        header('location:welcome.php'."?username=$userName");
    }
}
?>
<html>
 <head>
 
 </head>
 <body>
    <form action="" method="post">
        <p>
                      用户名：<input type="text" name="username" />
                      密码：<input type="text" name="password" />
            <input type="submit" value="登录"/>
        </p>
    </form>
 </body>
</html>

<?php
    /*
     * session使用：
     * 1.开启session
     * 2.添加session
     * 3.读取session数据
     * 4.销毁session数据
     * 5.session的扩展：默认session存储位置
     */
    session_start();
    $_SESSION=array('name' => '小明');
    $_SESSION = array();//销毁
    echo $_SESSION['name'];
//     $_SESSION['name']='小明';
//     $_SESSION['name']='小明1';
//     echo  $_SESSION['name'];
//     unset($_SESSION['name']);销毁且不可逆
//     echo $_SESSION['name'];
?>


<?php
    session_start();
    if (($_POST['username'] != null) && ($_POST['password'] != null)) {
        $userName = $_POST['username'];
        $passWord = $_POST['password'];
        
        $conn = mysqli_connect('localhost', 'root', 'root', 'test');
        $res = mysqli_query($conn, "select * from user where username='$userName'");
        $row = mysqli_fetch_assoc($res);
        if ($row['password'] == $passWord) {
            $_SESSION['username'] = $userName;
            $_SESSION['password'] = $passWord;
            header('Location:welcome.php');
        }
    }
?>

<?php
    session_start();
    $userName = $_SESSION['username'];
?>

<?php
    $goods = array();
    $i = 0;
    $conn = mysqli_connect('localhost', 'root', 'root', 'test');
    $res = mysqli_query($conn, 'select * from shop');
    while ($row = mysqli_fetch_assoc($res)){
        $goods[$i]['id'] = $row['id'];
        $goods[$i]['name'] = $row['name'];
        $goods[$i]['price'] = $row['price'];
        $i++;
    }
?>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    </head>
    <body>
        <?php
            foreach ($goods as $value){
                echo '商品名'.$value['name'].'价格'.$value['price'];
                echo "<a href=buy.php?name=".$value['name'].'&price='.
                $value['price'].">购买</a>";
                echo '<br />';
            }
        ?>
        <a href="shoppingCart.php">查看购物车</a>
    </body>
</html>


<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
    <?php
        session_start();
        $name = $_GET['name'];
        $price = $_GET['price'];
        
        $goods = $_SESSION['goods'];
        if ($name == $goods[$name]['name']) {
            $_SESSION['totalPrice'] += $price;
            $goods[$name]['number'] += 1;
        }else {
            $goods[$name]['name'] = $name;
            $goods[$name]['price'] = $price;
            $goods[$name]['number'] += 1;
            $_SESSION['totalPrice'] += $price;
        }
        $_SESSION['goods'] = $goods;
        header('location: goodsList.php');
    ?>
</body>
</html>

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
<?php
    session_start();
    $goods = $_SESSION['goods'];
    echo '您购买了：<br />';
    foreach ($goods as $value){
        echo $value['name'].'价格'.$value['price'].'数量'.$value['number'].'<br />';
    }
    echo '总数：'.$_SESSION['totalPrice'].'<br />';
?>
<a href="goodsList.php">返回商品列表</a>
</body>
</html>