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Here are some examples that you can use in your code to make use of PHP Auth.
 require_once 'Auth.class.php';
 $auth = new Auth;
 
 if ($auth->loggedIn) {
 // the user is logged in
 }
 
 $theUser = array(
 "username" => $username,
 "password" => $password,
 "url" => $url,
 "ip" => $auth->userIP
 );
 
 $numUsers = $auth->numUsers($theUser); // returns number of user with included user info
 
 if ($numUsers == 1){
 $auth->login($theUser);
 }
 
 $added = $auth->addUser($theUser);
 
 if (is_array($added)){
 $problems = array();
 foreach ($added as $key => $value){
 if ($value["problem"] == "unique")
 $theProblem = "<font color=red>« already taken</font>";
 if ($value["problem"] == "required")
 $theProblem = "<font color=red>« required</font>";
 if ($value["problem"] == "not valid")
 $theProblem = "<font color=red>« not a valid username</font>";
 array_push($problems, $theProblem);
 }
 } else {
 // the user was succesfully added
 }
 
 $auth->logout();
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