问如何在PHP中获取当前页面的Google +1计数？

EN

function getPlus1($url) {
    $html =  file_get_contents( "https://plusone.google.com/_/+1/fastbutton?url=".urlencode($url));
    $doc = new DOMDocument();   $doc->loadHTML($html);
    $counter=$doc->getElementById('aggregateCount');
    return $counter->nodeValue;
}

function getTweets($url){
    $json = file_get_contents( "http://urls.api.twitter.com/1/urls/count.json?url=".$url );
    $ajsn = json_decode($json, true);
    $cont = $ajsn['count'];
    return $cont;
}

function getPins($url){
    $json = file_get_contents( "http://api.pinterest.com/v1/urls/count.json?callback=receiveCount&url=".$url );
    $json = substr( $json, 13, -1);
    $ajsn = json_decode($json, true);
    $cont = $ajsn['count'];
    return $cont;
}

function getFacebooks($url) { 
    $xml = file_get_contents("http://api.facebook.com/restserver.php?method=links.getStats&urls=".urlencode($url));
    $xml = simplexml_load_string($xml);
    $shares = $xml->link_stat->share_count;
    $likes  = $xml->link_stat->like_count;
    $comments = $xml->link_stat->comment_count; 
    return $likes + $shares + $comments;
}

function get_plusones($url) {
  $curl = curl_init();
  curl_setopt($curl, CURLOPT_URL, "https://clients6.google.com/rpc");
  curl_setopt($curl, CURLOPT_POST, 1);
  curl_setopt($curl, CURLOPT_POSTFIELDS, '[{"method":"pos.plusones.get","id":"p","params":{"nolog":true,"id":"' . $url . '","source":"widget","userId":"@viewer","groupId":"@self"},"jsonrpc":"2.0","key":"p","apiVersion":"v1"}]');
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-type: application/json'));
  $curl_results = curl_exec ($curl);
  curl_close ($curl);
  $json = json_decode($curl_results, true);
  return intval( $json[0]['result']['metadata']['globalCounts']['count'] );
}

$url = 'http://nike.com';
$gplus_type = true ? 'shares' : '+1s';

/**
 * Get Google+ shares or +1's.
 * See out post at stackoverflow.com/a/23088544/328272
 */
function get_gplus_count($url, $type = 'shares') {
  $curl = curl_init();

  // According to stackoverflow.com/a/7321638/328272 we should use certificates
  // to connect through SSL, but they also offer the following easier solution.
  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

  if ($type == 'shares') {
    // Use the default developer key AIzaSyCKSbrvQasunBoV16zDH9R33D88CeLr9gQ, see
    // tomanthony.co.uk/blog/google_plus_one_button_seo_count_api.
    curl_setopt($curl, CURLOPT_URL, 'https://clients6.google.com/rpc?key=AIzaSyCKSbrvQasunBoV16zDH9R33D88CeLr9gQ');
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, '[{"method":"pos.plusones.get","id":"p","params":{"nolog":true,"id":"' . $url . '","source":"widget","userId":"@viewer","groupId":"@self"},"jsonrpc":"2.0","key":"p","apiVersion":"v1"}]');
    curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-type: application/json'));
  }
  elseif ($type == '+1s') {
    curl_setopt($curl, CURLOPT_URL, 'https://plusone.google.com/_/+1/fastbutton?url='.urlencode($url));
  }
  else {
    throw new Exception('No $type defined, possible values are "shares" and "+1s".');
  }

  $curl_result = curl_exec($curl);
  curl_close($curl);

  if ($type == 'shares') {
    $json = json_decode($curl_result, true);
    return intval($json[0]['result']['metadata']['globalCounts']['count']);
  }
  elseif ($type == '+1s') {
    libxml_use_internal_errors(true);
    $doc = new DOMDocument();
    $doc->loadHTML($curl_result);
    $counter=$doc->getElementById('aggregateCount');
    return $counter->nodeValue;
  }
}

// Get Google+ count.
$gplus_count = get_gplus_count($url, $gplus_type);