WordPress - Get Featured Image URL

functions.php

// Post thumbnails are pretty useful and pretty easy to use in WordPress. Simply add:
add_theme_support('post-thumbnails'); 

// To a theme's functions.php file and you'll get a Featured Image module on the admin screen for posts 
// which allows you to select one.
// It is also very easy to output that image as an HTML <img>:
the_post_thumbnail();


//Get the URL? 
// Say, you're going to use it as a background-image on an element rather than a content image. 
//Unfortunately there is no super easy/obvious function for that Within the loop, you'll have to do:
$thumb_id = get_post_thumbnail_id();
$thumb_url_array = wp_get_attachment_image_src($thumb_id, 'thumbnail-size', true);
$thumb_url = $thumb_url_array[0];

//Then $thumb_url will be that URL.