authentication problem
 

hi

i have got this code in php , but i can't undetstand few things in it. maybe anyone of you can help me out ... i don't understand if a user is prompted for a password , which one should i type to and where are the vules are checked from .. PHP_AUTH_USER


<?
function authenticate() {
header("WWW-Authenticate: Basic realm=\":-!\"");
header("HTTP/1.0 401 Unauthorized");
print("You must enter a valid login username and password
to access this resource.\n");
exit;
}
if(!isset($PHP_AUTH_USER)){ authenticate(); }
else {
$c=mysql_pconnect("server.name","user","password");
mysql_select_db("dbname",$c);
$q=sprintf("SELECT username,password FROM authenticateTable
WHERE username='%s' AND password=PASSWORD('%s')
AND ipaddress='%s'",
$PHP_AUTH_USER,$PHP_AUTH_PW,$REMOTE_ADDR);
$q=mysql_query($q);
if(mysql_num_rows($q)==0){ authenticate(); }
}
?>

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