Get attachments by slug

gistfile1.php

<?php
/**
 *
 * Gets the URL to a media item based on the media item's name (slug)
 * 
 * 
 * @param type $slug
 * @return type 
 * 
 * 
 */
function get_attachment_by_slug( $slug ) {

	if( empty( $slug ) )
		return;
	
	$query_images_args = array(
	    'post_type' => 'attachment',
	    'post_status' => 'inherit',
	    'name' => $slug
	);

	$query_images = new WP_Query( $query_images_args );

	$out = array( );

	if ( !empty( $query_images->posts ) ) {

		foreach ( $query_images->posts as $image ) {
			$out = wp_get_attachment_image_src( $image->ID, 'full' );
		}
	}

	return isset($out[0])?$out[0]:'';
}