Google+ Button "Likes" auslesen

gistfile1.php

function get_google_plus1_count($url)
{
  $ch = curl_init();
  curl_setopt_array($ch, array(
    CURLOPT_HTTPHEADER      => array('Content-type: application/json'),
    CURLOPT_POST            => true,
    CURLOPT_POSTFIELDS      => '[{"method":"pos.plusones.get","id":"p","params":{"nolog":true,"id":"'.$url.'","source":"widget","userId":"@viewer","groupId":"@self"},"jsonrpc":"2.0","key":"p","apiVersion":"v1"}]',
    CURLOPT_RETURNTRANSFER  => true,
    CURLOPT_SSL_VERIFYPEER  => false,
    CURLOPT_URL             => 'https://clients6.google.com/rpc?key=AIzaSyCKSbrvQasunBoV16zDH9R33D88CeLr9gQ'
  ));
  $res = curl_exec($ch);
  curl_close($ch);
 
  if( $res )
  {
    $json = json_decode($res,true);
    return $json[0]['result']['metadata']['globalCounts']['count'];
  }
  return false;
}