WordPress - get attachment by url parameter and display in page

WordPress - get attachment by name and display in page

http://xxx.com/race-results/?series=Attachment_Name_Here.html



	if( isset( $_GET['series'] ) ) {

		function get_attachment_url_by_slug( $slug ) {

			$args = array(
				'post_type' 		=> 'attachment',
				'name' 				=> $slug,
				'posts_per_page' 	=> 1,
				'post_status' 		=> 'inherit' 
			);

			$_header 	= new WP_Query($args);

			if( count($_header) > 0 ) {
				return $header = wp_get_attachment_url($_header->posts[0]->ID);
			} else {
				return $header = null;
			}

		}

		$slug = explode(".",$_GET['series']);

		$header_url = get_attachment_url_by_slug( $slug[0] );

		echo "
			<section class='l-section wpb_row height_medium'>
				<div class='l-section-h i-cf'>

					<div class='sailwave'>";

						if( $header_url ) {
							$doc = new DOMDocument();
							$doc->loadHTMLFile($header_url);
							echo $doc->saveHTML();
						} else {
							echo "Sorry, no results found.";
						}
				
					echo "</div>

				</div>
			</section>
		";

	}