How many times a web link has been shared on Twitter

countTwitterShares.js

// <https://www.barattalo.it/coding/how-many-times-a-web-link-has-been-shared-on-twitter/>
function readTwitterShares($url) {
 $s = file_get_contents("http://urls.api.twitter.com/1/urls/count.json".
   "?callback=?&url=".urlencode($url));
   preg_match("#(\"count\"):([0-9]*)#",$s,$ar);
   return isset($ar[2]) ? $ar[2] : 0;
}

echo readTwitterShares("https://www.nationalgeographic.com/science/article/a-psychedelic-surprise-may-be-thriving-in-your-local-garden");