<?php $thumb_url= get_https://www.100procentemail.com/labs/wp-content/uploads/2017/10/header-2.gif($thumb-size);
	  $thumb_low = strtolower($thumb_url);
	  if (strpos($thumb_low, '.gif') === false) {
	  	$thumb_size = 'large';
	  } else {
	  	$thumb_size = 'full';
	  } ?>