Online PHP editor | refs for U9Dfj

@ 2015-11-20T10:00:02Z

<?php

declare(strict_types=1);

function concat(string $separator = ' ', string ...$strings): string {
    return implode($separator, $strings);
}

echo concat(':', 'One', 'Two', 'Three') . "\n";
echo concat(null, '1', '2', '3');