Construct eMusic Image URLs by convention

images.php

<?php
/**
 * Convenience Method to construct Artist Image URL
 * 
 * @param int $id
 * @return string Returns URL for Artist Image 
 */
function artist_image_url( $id ) {
	$one = substr( $id, 0, 3 );
	$two = substr( $id, 3, 3 );

	if ( (int) $id < 10000000 ) {
		$one = '0';
		$two = '0';
	}

	$https = is_ssl() ? 's' : '';

	return sprintf( 'http%s://images.emusic.com/img/artist/%s/%s/%s.jpg', $https, $one, $two, $id );
}

/**
 * Convenience Method to construct Album Image URL
 * 
 * @param int $id ALbum ID
 * @return string Returns URL for Album Image 
 */
function album_image_url( $id ) {
	$one = substr( $id, 0, 3 );
	$two = substr( $id, 3, 3 );
	$https = is_ssl() ? 's' : '';
	return sprintf( 'http%s://images.emusic.com/music/images/album/%s/%s/%s/300x300.jpg', $https, $one, $two, $id );
}

/**
 * Convenience Method to construct Book Image URL
 * 
 * @param int $id
 * @return string Returns URL for Book Image 
 */
function book_image_url( $id ) {
	$one = substr( $id, 0, 3 );
	$two = substr( $id, 3, 3 );
	$https = is_ssl() ? 's' : '';
	return sprintf( 'http%s://images.emusic.com/books/images/book/0/%s/%s/%s/300x300.jpg', $https, $one, $two, $id );
}