Online PHP editor | output for lgpeD

@ 2023-06-23T11:25:51Z

<?php

$array = ['a', 'b', 'c', 'd','e','f','g'];

function combinations($array, $k) {
    if ($k === 0) {
        return [[]];
    }

    if (count($array) === $k) {
        return [$array];
    }

    if (count($array) < $k) {
        return [];
    }

    $results = [];

    list($firstElem, $restArray) = [array_slice($array, 0, 1), array_slice($array, 1)];

    foreach (combinations($restArray, $k - 1) as $combination) {
        $results[] = array_merge($firstElem, $combination);
    }

    foreach (combinations($restArray, $k) as $combination) {
        $results[] = $combination;
    }

    return $results;
}

$combinations = array_map('implode', combinations($array, 2));
print_r($combinations);

?>

Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.4.16, 8.5.0 - 8.5.1: Array ( [0] => ab [1] => ac [2] => ad [3] => ae [4] => af [5] => ag [6] => bc [7] => bd [8] => be [9] => bf [10] => bg [11] => cd [12] => ce [13] => cf [14] => cg [15] => de [16] => df [17] => dg [18] => ef [19] => eg [20] => fg )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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