Online PHP editor | output for HpYN5

@ 2023-05-06T03:25:59Z

<?php

$lookup = array_flip(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']);

$months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Sep', 'Oct', 'Dec', 'Jan', 'Feb'];

$result = [];
foreach ($months as $month) {
    if (isset($ref) && $lookup[$month] === ($lookup[$last] + 1) % 12) {
        $ref = strtok($ref, "-") . "-$month";
    } else {
        unset($ref);
        $ref = $month;
        $result[] = &$ref;
    }
    $last = $month;
}
var_export($result);

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, 8.5.0: array ( 0 => 'Jan-Jun', 1 => 'Sep-Oct', 2 => 'Dec-Feb', )
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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