本文實例講述了php使用Header函數,PHP_AUTH_PW和PHP_AUTH_USER做用戶驗證的方法。分享給大家供大家參考,具體如下:
在php中,可以使用Header函數做一些有趣的事情,用戶驗證就是其中一個很有意思的功能。具體用法:
Header("WWW-Authenticate: Basic realm="USER LOGIN""); Header("HTTP/1.0 401 Unauthorized");
在頁首設計這兩個Header函數,頁面在載入前會出現一個登錄框,要求輸入用戶名和密碼。習慣了在頁面登錄的我們,是否覺得這樣的登錄很原始,又很新奇呢?
為了獲取從這個對話框中傳來的用戶名和密碼,需要用到php提供的兩個特殊變量$PHP_AUTH_USER和$PHP_AUTH_PW,要這樣使用這兩個特殊變量好像需要在php.ini中設置相關的選項,不然就只能像下面這樣引用:
$_SERVER['PHP_AUTH_USER'] $_SERVER['PHP_AUTH_PW']
獲取到用戶提交上來的用戶名和密碼之後,要怎樣處理邏輯就跟我們一般的程序處理沒有什麼區別了。下面提供兩個例程供參考:
<?php if(!isset($PHP_AUTH_USER)) { Header("WWW-authenticate: basic realm="XXX""); Header("HTTP/1.0 401 Unauthorized"); $title="Login Instructions"; ?> <blockquote> In order to enter this section of the web site, you must be an XXX subscriber. If you are a subscriber and you are having trouble logging in, please contact <a href="mailto:[email protected]">[email protected]</a>. </blockquote> <?php exit; } else { mysql_pconnect("localhost","nobody","") or die("Unable to connect to SQL server"); mysql_select_db("xxx") or die("Unable to select database"); $user_id=strtolower($PHP_AUTH_USER); $password=$PHP_AUTH_PW; $query = mysql_query("select * from users where user_id='$user_id' and password='$password'"); if(!mysql_num_rows($query)) { Header("WWW-authenticate: basic realm="XXX""); Header("HTTP/1.0 401 Unauthorized"); $title="Login Instructions"; ?> <blockquote> In order to enter this section of the web site, you must be an XXX subscriber. If you are a subscriber and you are having trouble logging in, please contact <a href="mailto:[email protected]">[email protected]</a>. </blockquote> <?php exit; } $name=mysql_result($query,0,"name"); $email=mysql_result($query,0,"email"); mysql_free_result($query); } ?>
另外一個參考的例程:
<?php //assume user is not authenticated $auth = false; $user = $_SERVER['PHP_AUTH_USER']; $pass = $_SERVER['PHP_AUTH_PW']; if ( isset($user) && isset($pass) ) { //connect to db include 'db_connect.php'; //SQL query to find if this entered username/password is in the db $sql = "SELECT * FROM healthed_workshop_admin WHERE user = '$PHP_AUTH_USER' AND pass = '$PHP_AUTH_PW'"; //put the SQL command and SQL instructions into variable $result = mysql_query($sql) or die('Unable to connect.'); //get number or rows in command; if more than 0, row is found $num_matches = mysql_num_rows($result); if ($num_matches !=0) { //matching row found authenticates user $auth = true; } } if (!$auth) { header('WWW-Authenticate: Basic realm="Health Ed Presentation Admin"'); header('HTTP/1.0 401 Unauthorized'); echo 'You must enter a valid username & password.'; exit; } else { echo 'Success!'; } ?>
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希望本文所述對大家PHP程序設計有所幫助。