WordPress featured image as background with fallback image

wordpress-featured-img-bg-fallback-img.php

<?php 
//define fallback image path
$thumb = get_template_directory_uri().'/images/fallback-image.jpg';
if ( has_post_thumbnail() ) {  
//override  fallback image if post has any thumbnail
$thumb = get_the_post_thumbnail_url();
}
?>


<div class="page-header" style="background-image: url('<?php echo $thumb;?>')">
  <h1><?php the_title(); ?></h1>
</div>