get_header_image() WordPress Function

function get_header_image() {
	$url = get_theme_mod( 'header_image', get_theme_support( 'custom-header', 'default-image' ) );

	if ( 'remove-header' === $url ) {
		return false;
	}

	if ( is_random_header_image() ) {
		$url = get_random_header_image();
	}

	return esc_url_raw( set_url_scheme( $url ) );
}
Uses	Description
wp-includes/theme.php:get_theme_support()	Gets the theme support arguments passed when registering that support.
wp-includes/theme.php:is_random_header_image()	Checks if random header image is in use.
wp-includes/theme.php:get_random_header_image()	Gets random header image URL from registered images in theme.
wp-includes/theme.php:get_theme_mod()	Retrieves theme modification value for the active theme.
wp-includes/formatting.php:esc_url_raw()	Performs esc_url() for database or redirect usage.
wp-includes/link-template.php:set_url_scheme()	Sets the scheme for a URL.
Used By	Description
wp-admin/includes/template.php:get_media_states()	Retrieves an array of media states from an attachment.
wp-includes/theme.php:get_header_video_settings()	Retrieves header video settings.
wp-includes/theme.php:get_header_image_tag()	Creates image tag markup for a custom header image.
wp-includes/theme.php:has_header_image()	Checks whether a header image is set or not.
wp-admin/includes/class-custom-image-header.php:Custom_Image_Header::step_1()	Display first step of custom header image page.
wp-includes/theme.php:_delete_attachment_theme_mod()	Checks an attachment being deleted to see if it’s a header or background image.
wp-includes/theme.php:header_image()	Displays header image URL.