Set Featured Image as Background/Header on Cafe Pro

set-featured-image-as-background-min.php

<?php
	add_action( 'wp_head', 'trm_set_page_post_featured_image_as_header' );
	function trm_set_page_post_featured_image_as_header(){
		if( is_single() || is_page() ){
			if( has_post_thumbnail() ){
				$featured_image_url = get_the_post_thumbnail_url();

				echo '<!-- Feat. Img set in Appearance > Custom Functions -->
				<style>
					.front-page-header {
						background-image: url( '. $featured_image_url .' );
					}
				</style>';
			}
		}
	}
?>

set-featured-image-as-background.php

<?php
	/**
	 * Set the "Featured Image" as the header background on posts & pages
	 *
	 * @return:		A `style` tag setting the header background image.
	 * @author:		Alex Demchak
	 *
	 * @NOTE:
	 *	• This is added to `wp_head` to give precendence to the style without
	 *	  resorting to heavy selectors, hacks, or !important.
	 *	• Modify conditionals `is_single()`, `is_page()`, etc. if desired.
	 *	• `if( has_post_thumbnail() ) {}` should remain as to not display
	 *	  blank background images on items without featured images.
	 *	• The `.front-page-header` CSS selector will need to change based
	 *	  on whichever theme is active.
	 *	• This is NOT Genesis specific, use anywhere!
	*/

	##       (\ /)
	##      ( . .) ♥ ~< Woofie Says: Don't Delete Me! >
	##      c(")(")

	add_action( 'wp_head', 'trm_set_page_post_featured_image_as_header' );
	function trm_set_page_post_featured_image_as_header(){
		// Check to see if it's a single post/custom post type or page
		if( is_single() || is_page() ){
			// Great, now see if a "Featured Image" has been set
			if( has_post_thumbnail() ){
				// Set it as a variable, I don't like echoing in return context
				$featured_image_url = get_the_post_thumbnail_url();

				// Finally write our little `style` tag.
				echo '<!-- Featured Image - Set in Appearance > Custom Functions -->
				<style>
					.front-page-header {
						background-image: url( '. $featured_image_url .' );
					}
				</style>';
			}
		}
	}
?>