How to do authentication process with PHP?

[mshen]

authentication process is a default login popup window and ask user name and password.

How to do it with php?I want to do it.Thanks

Mark

[rachel2004]

What's the part that you're unclear about?

[mshen]

I try the code but I can not pass through.do I have to change configration file? I always get a pop-up window.

<?php
if (!isset($SERVER['PHP_AUTH_USER'])) {
header('WWW-Authenticate: Basic realm="My Realm"');
header('HTTP/1.0 401 Unauthorized');
echo 'Text to send if user hits Cancel button';
exit;
} else {
echo "<p>Hello {$SERVER['PHP_AUTH_USER']}.</p>";
echo "<p>You entered {$_SERVER['PHP_AUTH_PW']} as your password.</p>";
}
?>

[mshen]

After I enter the user name and password.the pop-up window appear again and still ask user name and password.the program can not print out "hello ...".

My question is why $_SERVER['PHP_AUTH_USER is always not existed.even if I enter user name and password.

Do I have to change settings?Please help me.