Online PHP editor | output for gJB8q

@ 2017-12-14T07:47:04Z

<?php
declare(strict_types=1);

/**
 * @param array $elements
 * @param array $extra
 *
 * @return Generator
 */
function gen(array $elements, array $extra = []): \Generator {

    foreach ($elements as $i => $head) {
        foreach (gen(array_slice($elements, $i + 1), $extra) as $tail) {
            yield array_merge([$head], $tail);
        }
    }

    yield $extra;
}

foreach (gen(['O', 'U', 'W', 'P'], ['template']) as $path) {
    echo implode(' / ', $path), "\n";
}

Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: O / U / W / P / template O / U / W / template O / U / P / template O / U / template O / W / P / template O / W / template O / P / template O / template U / W / P / template U / W / template U / P / template U / template W / P / template W / template P / template template
Output for 5.6.0 - 5.6.40: Warning: Unsupported declare 'strict_types' in /in/gJB8q on line 2 Parse error: syntax error, unexpected ':', expecting '{' in /in/gJB8q on line 10
Process exited with code 255.

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