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php中如何使用Header函数,很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
具体如下:
在php中,可以使用Header函数做一些有趣的事情,用户验证就是其中一个很有意思的功能。具体用法:
Header("WWW-Authenticate: Basic realm="USER LOGIN""); Header("HTTP/1.0 401 Unauthorized");
在页首设计这两个Header函数,页面在载入前会出现一个登录框,要求输入用户名和密码。习惯了在页面登录的我们,是否觉得这样的登录很原始,又很新奇呢?
为了获取从这个对话框中传来的用户名和密码,需要用到php提供的两个特殊变量$PHP_AUTH_USER和$PHP_AUTH_PW,要这样使用这两个特殊变量好像需要在php.ini中设置相关的选项,不然就只能像下面这样引用:
$_SERVER['PHP_AUTH_USER'] $_SERVER['PHP_AUTH_PW']
获取到用户提交上来的用户名和密码之后,要怎样处理逻辑就跟我们一般的程序处理没有什么区别了。下面提供两个例程供参考:
<?php if(!isset($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:support@xxx.com">support@xxx.com</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:support@xxx.com">support@xxx.com</a>. </blockquote> <?php exit; } $name=mysql_result($query,0,"name"); $email=mysql_result($query,0,"email"); mysql_free_result($query); } ?>
另外一个参考的例程:
<?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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