facebook - PHP FB Login not working -

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i trying create fb login page in php not working. on chrome, blank page, on ie error 500 (page cannot displayed). have curl extension on php installation, have enabled on php.ini file. have created app on facebook. url have put http://localhost/appname testing purposes. code ripped off developers.facebook.com.

can please walk me through on going wrong? thanks.

<?php require_once('facebook.php'); $config = array(   'appid' => 'xxxx',   'secret' => 'xxxxx',   'allowsignedrequest' => false // optional should set false non-canvas apps ); $facebook = new facebook($config); $user_id = $facebook->getuser(); ?> <html>   <head></head>   <body>   <?php     if($user_id){        try{           $user_profile = $facebook->api('/me','get');           echo "name: " . $user_profile['name'];        }        catch(facebookapiexception $e){           $login_url = $facebook->getloginurl();            echo 'please <a href="' . $login_url . '">login.</a>';           error_log($e->gettype());           error_log($e->getmessage());        }        }      else{        //no user, print link user login        $login_url = $facebook->getloginurl();        echo 'please <a href="' . $login_url . '">login.</a>';     }   ?> </body> </html>


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