Natural Language Implode for PHP

nl_implode.php

<?php

if (! function_exists('nl_implode')) {
    function nl_implode(array $list, $conjunction = 'and', $oxford_comma = true) {
        $last = array_pop($list);

        if ($list) {
            return implode(', ', $list) . ($oxford_comma ? ',' : '') . ' ' . $conjunction . ' ' . $last;
        }

        return (string) $last;
    }
}


/**
 * Examples
 */

var_dump(nl_implode([]));
// string ''

var_dump(nl_implode(['one']));
// string 'one'

var_dump(nl_implode(['one', 'two']));
// string 'one, and two'

var_dump(nl_implode(['one', 'two', 'three']));
// string 'one, two, and three'

var_dump(nl_implode(['one', 'two', 'three', 'four'], 'or'));
// string 'one, two, three, or four'

var_dump(nl_implode(['one', 'two', 'three', 'four'], 'and', false));
// string 'one, two, three and four'