add featured post image functions.php code example

Example 1: wordpress get post thumbnail

   ALL parameters are optional. Not needed if you are on WP LOOP
*/
echo get_the_post_thumbnail( $the_query->ID, array( 500, 400) ); 
/* USE get_the_post_thumbnail_url() to get only the image url */
?>

Example 2: show featured image in post wordpress

 'class1 class2' ))
} else { ?>