wordpress theme featured image code example

Example 1: wordpress featured image show

<?php echo the_post_thumbnail(); ?>

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; ?>);">

Example 3: add featured image

function fn_add_featured(){
   add_theme_support( 'post-thumbnails' );
   add_image_size( 'post-imge', 730, 380 );
}

add_action('after_setup_theme','fn_add_featured');