今天用PHP做了一個登錄登出的功能

登錄代碼

if($_POST['password']=='xxxxx'){
        if (!session_id()) session_start();
        $_SESSION['password'] = 'xxxxxx';
        $this->getMessage("登錄成功！",'/');
    }else{
        $this->getMessage("密碼錯誤！",'/');
}

檢查代碼

if (!session_id()) session_start();
        $userName = '';
        if(isset($_SESSION['password'])&&$_SESSION['password']=='xxxxx'){
            $userName= array('id'=>'1','name'=>'admin');
        }
        if(!empty($userName)){
            $GLOBALS['user'] = $userName;
        }

登出代碼

if (!session_id()) session_start();
        if(isset($_SESSION['password'])){
            unset($_SESSION['password']);
        }
        $this->getMessage("登出成功！",'/xxxx');

思路就是這樣根據$GLOBALS['user']的值是否為空來判斷用戶是否登錄。