login && session

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運用session儲存使用者的登入狀態。

session相關：

1 session_start();               //啟用變數$_SESSION[]2 $_SESSION[‘username‘] = $username;          3 unset($_SESSION[‘username‘]);        //清空變數4 session_destroy();           //清除會話

本例實現的功能：

login,   logout

 

後台：process.php

 1     // login 2     if(@$_POST["login_submit"]){ 3         $str = "SELECT * FROM users WHERE username=‘$_POST[username]‘ and password=‘$_POST[password]‘"; 4         $res = mysql_query($str); 5         if(mysql_fetch_array($res)){ 6             session_start(); 7             $_SESSION[‘username‘] = $_POST[‘username‘]; 8             exit($_SESSION[‘username‘].‘歡迎你！點擊此處 <a href="index.php">返回首頁</a><br />‘); 9         }else10             exit(‘登入失敗！點擊此處 <a href="javascript:history.back(-1);">返回</a>‘);11     }12 13     // logout14     if(@$_GET["action"] == "logout"){15         session_start();16         unset($_SESSION[‘username‘]);17         session_destroy();18         exit(‘登出成功！點擊此處 <a href="index.php">返回首頁</a><br />‘);19     }

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前台: index.php

 1             <?php 2                 session_start();                //!!!!!! 3                 if(empty($_SESSION["username"])){ 4                     echo              5                     "<div><a href=‘register.php‘>register</a></div> 6                     <form action=‘process.php‘ method=‘post‘> 7                         username:<input type=‘text‘ name=‘username‘ /><br/> 8                         password:<input type=‘password‘ name=‘password‘ /><br/> 9                         <input type=‘submit‘ name=‘login_submit‘ value=‘login‘/>10                     </form>";11                 }else{12                     echo 13                     "<div>14                         <div><a href=‘home.php?‘>{$_SESSION["username"]}</a></div>15                         <div><a href=‘process.php?action=logout‘>登出</a></div>16                     </div>";17                 }18             ?>

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