Online PHP editor | output for 7AOGf

@ 2018-11-03T16:00:04Z

<?php
$numbers = [1, 2, 3, 4, 5, 6, 7, 11, 21, 22, 23, 24];

$prev = -1;
foreach ($numbers as $n) {
    if (!isset($start)) {
        $start = $n;
    } elseif ($n != $prev + 1) {
        $result[] = $start == $prev ? $prev : "$start-$prev";
        $start = $n;
    }
    $prev = $n;
}
$result[] = $start == $prev ? $prev : $start . '-' . $prev;
echo implode(', ', $result);

Output for 5.6.38, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: 1-7, 11, 21-24
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 1-7, 11, 21-24

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