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@ 2018-02-04T18:07:23Z

<?php

function is_leap_year(int $year) {
    return $year % 4 == 0 and ($year % 100 != 0 or $year % 400 == 0);
}

$year = 2016;
var_dump(is_leap_year($year) === date('L', $year)); # true

$year = 2018;
var_dump(is_leap_year($year) === date('L', $year)); # false

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
date: documentation ( source)

preferences:dark modelive preview

63.99 ms | 402 KiB | 5 Q