wordpress add featured image code example

Example 1: get featured image url in wordpress

if ( has_post_thumbnail()) {
   $large_image_url = wp_get_attachment_image_src( get_post_thumbnail_id(), 'large');
   echo '<a href="' . $large_image_url[0] . '">';
   the_post_thumbnail('thumbnail');
   echo '</a>';
}

Example 2: wordpress featured image as a background image

<?php
  	if ( has_post_thumbnail() ) {
    	$image_b1 = get_the_post_thumbnail_url();
  	}
	else {
  		$image_b1 = get_stylesheet_directory_uri().'/images/noimage.png';
	}
?>
  
 <div style="background-image: url(<?php echo $image_b1; ?>);">