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@ 2020-08-01T20:19:12Z

<?php

function is_even(int $n): bool {
    $fn = null;
    $fn = fn(int $nr, bool $not): bool => $nr === 0 ? !$not : $fn(($nr < 0 ? abs($nr) : $nr) - 1, !$not);
    
    return $fn($n, false);
}

for($i = -5; $i <= 12; $i++) {
    printf('is %d even? %s.%s', $i, is_even($i) ? 'yes': 'no', "\n");
}

Output
Performance
VLD
References
Branches

abs: documentation ( source)
printf: documentation ( source)

preferences:dark modelive preview

37.99 ms | 402 KiB | 5 Q