json - Facebook Graph - getting the Facebook ID - using PHP -

i have form in post facebook url.

i process url in php script facebook id.

form:

<form name="input" method="post"  action="<?=($_server['php_self'])?>">  <input name="url" required>  <input type="submit" value="submit"> 

php script

$url =  $_request["url"];    $jsonurl = 'http://graph.facebook.com/'.$url.'.json'; $json = file_get_contents($jsonurl,0,null,null); $json_output = json_decode($json);   $fbid = ($json_output->id);  echo $fbid; 

i've not been able pull in id. i'm echoing nothing.

the url be:

$jsonurl = 'http://graph.facebook.com/'.$url; 

...while $url must graph api endpoint or vanity url available in public, without access token. no ".json" required.

for example:

$url = 'bladauhu'; $json_result = file_get_contents('http://graph.facebook.com/'.$url); $json = json_decode($json_result); echo $json->id;