php session management and control-PHP Tutorial-php.cn

php session management and control

jacklove

Release： 2023-03-27 12:02:02

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This article will introduce the relevant content of PHP session management and control.

php session management and control

<?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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