PHP Basics Eight Session Management and Control-PHP Tutorial-php.cn

PHP Basics Eight Session Management and Control

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Release： 2023-03-24 16:34:01

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The content of this article is about the basic session management and control of PHP. It has a certain reference value. Now I share it with you. Friends in need can refer to it

<!-- 第十四章 php会话管理和控制 -->
<?php
    setcookie(&#39;name&#39;);
    setcookie(&#39;mycookie&#39;);
    setcookie(&#39;mycookie&#39;,&#39;&#39;);
    setcookie("mycookie",false);
    setcookie(&#39;mycookie&#39;,&#39;&#39;,time()-3600);
    echo ($HTTP_COOKIE_VARS[&#39;mycookie&#39;]);
    print_r($_COOKIE);
?>


<?php
if (($_POST[&#39;username&#39;] != null) && ($_POST[&#39;password&#39;] != null)) {
    $userName = $_POST[&#39;username&#39;];
    $passWord =md5($_POST[&#39;password&#39;]);
    $conn = mysqli_connect(&#39;localhost&#39;, &#39;root&#39;, &#39;root&#39;);
    mysqli_select_db($conn, &#39;test&#39;);
    $sql = "select * from user where &#39;username = &#39;$userName&#39;";
    $res = mysqli_query($conn, $sql);
    $row = mysqli_fetch_assoc($res);
    if ($row[&#39;password&#39;] == $passWord) {
        setcookie(&#39;username&#39;,$userName,time()+60*60*24*30);
        setcookie(&#39;password&#39;,$passWord,time()+60*60*24*30);
        header(&#39;Location: welcome.php&#39;."?username=$userName");
    }
}
if (($_COOKIE[&#39;username&#39;] != null) && ($_COOKIE[&#39;password&#39;] != null)) {
    $userName = $_COOKIE[&#39;username&#39;];
    $passWord = $_COOKIE[&#39;password&#39;];
    $conn = mysqli_connect(&#39;localhost&#39;, &#39;root&#39;, &#39;root&#39;, &#39;test&#39;);
    $res = mysqli_query($conn, "select * from user where username = &#39;$userName&#39;");
    $row = mysqli_fetch_assoc($res);
    if ($row[&#39;password&#39;] == $passWord) {
        header(&#39;location:welcome.php&#39;."?username=$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(&#39;name&#39; => &#39;小明&#39;);
    $_SESSION = array();//销毁
    echo $_SESSION[&#39;name&#39;];
//     $_SESSION[&#39;name&#39;]=&#39;小明&#39;;
//     $_SESSION[&#39;name&#39;]=&#39;小明1&#39;;
//     echo  $_SESSION[&#39;name&#39;];
//     unset($_SESSION[&#39;name&#39;]);销毁且不可逆
//     echo $_SESSION[&#39;name&#39;];
?>


<?php
    session_start();
    if (($_POST[&#39;username&#39;] != null) && ($_POST[&#39;password&#39;] != null)) {
        $userName = $_POST[&#39;username&#39;];
        $passWord = $_POST[&#39;password&#39;];
        
        $conn = mysqli_connect(&#39;localhost&#39;, &#39;root&#39;, &#39;root&#39;, &#39;test&#39;);
        $res = mysqli_query($conn, "select * from user where username=&#39;$userName&#39;");
        $row = mysqli_fetch_assoc($res);
        if ($row[&#39;password&#39;] == $passWord) {
            $_SESSION[&#39;username&#39;] = $userName;
            $_SESSION[&#39;password&#39;] = $passWord;
            header(&#39;Location:welcome.php&#39;);
        }
    }
?>

<?php
    session_start();
    $userName = $_SESSION[&#39;username&#39;];
?>

<?php
    $goods = array();
    $i = 0;
    $conn = mysqli_connect(&#39;localhost&#39;, &#39;root&#39;, &#39;root&#39;, &#39;test&#39;);
    $res = mysqli_query($conn, &#39;select * from shop&#39;);
    while ($row = mysqli_fetch_assoc($res)){
        $goods[$i][&#39;id&#39;] = $row[&#39;id&#39;];
        $goods[$i][&#39;name&#39;] = $row[&#39;name&#39;];
        $goods[$i][&#39;price&#39;] = $row[&#39;price&#39;];
        $i++;
    }
?>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    </head>
    <body>
        <?php
            foreach ($goods as $value){
                echo &#39;商品名&#39;.$value[&#39;name&#39;].&#39;价格&#39;.$value[&#39;price&#39;];
                echo "<a href=buy.php?name=".$value[&#39;name&#39;].&#39;&price=&#39;.
                $value[&#39;price&#39;].">购买</a>";
                echo &#39;<br />&#39;;
            }
        ?>
        <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[&#39;name&#39;];
        $price = $_GET[&#39;price&#39;];
        
        $goods = $_SESSION[&#39;goods&#39;];
        if ($name == $goods[$name][&#39;name&#39;]) {
            $_SESSION[&#39;totalPrice&#39;] += $price;
            $goods[$name][&#39;number&#39;] += 1;
        }else {
            $goods[$name][&#39;name&#39;] = $name;
            $goods[$name][&#39;price&#39;] = $price;
            $goods[$name][&#39;number&#39;] += 1;
            $_SESSION[&#39;totalPrice&#39;] += $price;
        }
        $_SESSION[&#39;goods&#39;] = $goods;
        header(&#39;location: goodsList.php&#39;);
    ?>
</body>
</html>

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
<?php
    session_start();
    $goods = $_SESSION[&#39;goods&#39;];
    echo &#39;您购买了：<br />&#39;;
    foreach ($goods as $value){
        echo $value[&#39;name&#39;].&#39;价格&#39;.$value[&#39;price&#39;].&#39;数量&#39;.$value[&#39;number&#39;].&#39;<br />&#39;;
    }
    echo &#39;总数：&#39;.$_SESSION[&#39;totalPrice&#39;].&#39;<br />&#39;;
?>
<a href="goodsList.php">返回商品列表</a>
</body>
</html>

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