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@ 2025-08-11T23:03:23Z

<?php

$name = 'mickmackusa';

$yob = fn(?int $age): ?int => !$age
    ? null
    : (
        fn($birthYear) => $birthYear * print "$name's birth year is $birthYear\n"
    )(date('Y') - $age);

var_export($yob(null));
echo "\n---\n";
var_export($yob(31));

Output
Performance
VLD
References
Branches

var_export: documentation ( source)
date: documentation ( source)

preferences:dark modelive previewkey bindings

25.12 ms | 405 KiB | 5 Q