Excluding user agents list from loading specific script on your website.

exclude_user_agent_load_script

<?php
$UA_list = array("GT-I9300","SM-N900T"); //list all user agents you want to block here "using any keyword"
$current_UA = $_SERVER['HTTP_USER_AGENT']; //getting the current user agent
$matchFound = preg_match_all("/\b(" . implode($UA_list,"|") . ")\b/i",$current_UA,$matches); //check if the current user agent is in the block list
if($matchFound){
  //do nothing!
}else{ //print the script
?>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.5&appId=794034927388702";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
<?php
}
?>