Creates a human readable list of an array, implodes all items, but combines last two first.

helper_array_to_listing.php

<?php
/**
 * Creates a human readable list of an array
 * 
 * @param string[] $ranges array to list items of
 * @param string $glue normal glue between items
 * @param string $last glue between last two items
 *
 * @remarks works with 0, 1, 2 or 3+ items
 * @returns string 'item1, item2, item3 or item4'
 */
function array_listing( $ranges, $glue = ', ', $last = ' or ') {
    array_splice( $ranges, -2, 2, implode( $last, array_slice( $ranges, -2, 2 ) ) );
    return implode( $glue , $ranges );
}
?>