Get values for Schema.org interactionCount properties

interactionCounts.php

/* 
Example : 

<?php $url = 'http' . ($_SERVER['HTTPS'] ? 's':'') .'://'.$_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]; ?>
<meta itemprop="interactionCount" content="UserTweets:<?php echo get_tweets($url);?>"/>

*/

function get_tweets($url) {
   $url = urlencode($url);
    $json_string = file_get_contents('http://urls.api.twitter.com/1/urls/count.json?url=' . $url);
    $json = json_decode($json_string, true);
 
    return intval( $json['count'] );
}
 
function get_likes($url) {
  	$url = urlencode($url);
    $json_string = file_get_contents('http://graph.facebook.com/?ids=' . $url);
    $json = json_decode($json_string, true);
 
    return intval( $json[$url]['shares'] );
}
 
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'] );
}