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php使用session來保存用戶登錄信息
使用session保存頁(yè)面登錄信息
1、數(shù)據(jù)庫(kù)連接配置頁(yè)面：connectvars.php- <?php//數(shù)據(jù)庫(kù)的位置define('DB_HOST', 'localhost');//用戶名define('DB_USER', 'root');//口令define('DB_PASSWORD', '19900101');//數(shù)據(jù)庫(kù)名define('DB_NAME','test') ;?>
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- <?php//插入連接數(shù)據(jù)庫(kù)的相關(guān)信息require_once 'connectvars.php';//開啟一個(gè)會(huì)話session_start();$error_msg = "";//如果用戶未登錄，即未設(shè)置$_SESSION['user_id']時(shí)，執(zhí)行以下代碼if(!isset($_SESSION['user_id'])){ if(isset($_POST['submit'])){//用戶提交登錄表單時(shí)執(zhí)行如下代碼 $dbc = mysqli_connect(DB_HOST,DB_USER,DB_PASSWORD,DB_NAME); $user_username = mysqli_real_escape_string($dbc,trim($_POST['username'])); $user_password = mysqli_real_escape_string($dbc,trim($_POST['password'])); if(!empty($user_username)&&!empty($user_password)){ //MySql中的SHA()函數(shù)用于對(duì)字符串進(jìn)行單向加密 $query = "SELECT user_id, username FROM mismatch_user WHERE username = '$user_username' AND "."password = SHA('$user_password')"; //用用戶名和密碼進(jìn)行查詢 $data = mysqli_query($dbc,$query); //若查到的記錄正好為一條，則設(shè)置SESSION，同時(shí)進(jìn)行頁(yè)面重定向 if(mysqli_num_rows($data)==1){ $row = mysqli_fetch_array($data); $_SESSION['user_id']=$row['user_id']; $_SESSION['username']=$row['username']; $home_url = 'loged.php'; header('Location: '.$home_url); }else{//若查到的記錄不對(duì)，則設(shè)置錯(cuò)誤信息 $error_msg = 'Sorry, you must enter a valid username and password to log in.'; } }else{ $error_msg = 'Sorry, you must enter a valid username and password to log in.'; } }}else{//如果用戶已經(jīng)登錄，則直接跳轉(zhuǎn)到已經(jīng)登錄頁(yè)面 $home_url = 'loged.php'; header('Location: '.$home_url);}?><html> <head> <title>Mismatch - Log In</title> <link rel="stylesheet" type="text/css" href="style.css" /> </head> <body> <h3>Msimatch - Log In</h3> <!--通過$_SESSION['user_id']進(jìn)行判斷，如果用戶未登錄，則顯示登錄表單，讓用戶輸入用戶名和密碼--> <?php if(!isset($_SESSION['user_id'])){ echo '<p class="error">'.$error_msg.'</p>'; ?> <!-- $_SERVER['PHP_SELF']代表用戶提交表單時(shí)，調(diào)用自身php文件 --> <form method = "post" action="<?php echo $_SERVER['PHP_SELF'];?>"> <fieldset> <legend>Log In</legend> <label for="username">Username:</label> <!-- 如果用戶已輸過用戶名，則回顯用戶名 --> <input type="text" id="username" name="username" value="<?php if(!empty($user_username)) echo $user_username; ?>" /> <br/> <label for="password">Password:</label> <input type="password" id="password" name="password"/> </fieldset> <input type="submit" value="Log In" name="submit"/> </form> <?php } ?> </body></html>
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- <?php//使用會(huì)話內(nèi)存儲(chǔ)的變量值之前必須先開啟會(huì)話session_start();//使用一個(gè)會(huì)話變量檢查登錄狀態(tài)if(isset($_SESSION['username'])){ echo 'You are Logged as '.$_SESSION['username'].'<br/>'; //點(diǎn)擊“Log Out”,則轉(zhuǎn)到logOut頁(yè)面進(jìn)行注銷 echo '<a href="logOut.php"> Log Out('.$_SESSION['username'].')</a>';}/**在已登錄頁(yè)面中，可以利用用戶的session如$_SESSION['username']、 * $_SESSION['user_id']對(duì)數(shù)據(jù)庫(kù)進(jìn)行查詢，可以做好多好多事情*/?>
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- <?php//即使是注銷時(shí)，也必須首先開始會(huì)話才能訪問會(huì)話變量session_start();//使用一個(gè)會(huì)話變量檢查登錄狀態(tài)if(isset($_SESSION['user_id'])){ //要清除會(huì)話變量，將$_SESSION超級(jí)全局變量設(shè)置為一個(gè)空數(shù)組 $_SESSION = array(); //如果存在一個(gè)會(huì)話cookie，通過將到期時(shí)間設(shè)置為之前1個(gè)小時(shí)從而將其刪除 if(isset($_COOKIE[session_name()])){ setcookie(session_name(),'',time()-3600); } //使用內(nèi)置session_destroy()函數(shù)調(diào)用撤銷會(huì)話 session_destroy();}//location首部使瀏覽器重定向到另一個(gè)頁(yè)面$home_url = 'logIn.php';header('Location:'.$home_url);?>
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發(fā)表于 2012-03-11 22:47
