How can PHP developers accurately determine if a given year is a leap year within their code?

To accurately determine if a given year is a leap year in PHP, developers can use the following logic: a leap year is divisible by 4, unless it is divisible by 100 but not by 400. This can be implemented in PHP by creating a function that checks these conditions and returns true if the year is a leap year, and false if it is not. 

function isLeapYear($year) {
    if (($year % 4 == 0 && $year % 100 != 0) || $year % 400 == 0) {
        return true;
    } else {
        return false;
    }
}

// Example usage
$year = 2020;
if (isLeapYear($year)) {
    echo "$year is a leap year.";
} else {
    echo "$year is not a leap year.";
}

Keywords

PHP leap year date calculation validation

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