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mcal_days_in_month — Returns the number of days in the given month, needs to know if the year is a leap year or not


int mcal_days_in_month(month, leap);
int month: The month, 1 - 12, 1 being January, 12 being December
bool leap: Whether or not it is a leap year


The number of days in the given month, taking into account whether or not it is a leap year, or -1 on an error


mcal_days_in_month() tells you how many days there are in a given month. This is not especially useful for checking how many days there are in February, since you already need to know whether or not it is a leap year. However, it is extremely useful if you want to avoid hardcoding month-specific logic into your application.


PHP 3 since 3.0.13, PHP 4 since 4.0b4


Example 702. Determining how many days there are in each month of a year

$year = 2002;
$isLeap = mcal_is_leap_year($year);

echo "There are: ";
for ($month = MCAL_JANUARY; $month <= MCAL_DECEMBER; $month++) {
    if ($month == MCAL_DECEMBER) {
        echo " and ";
    } elseif  ($month != MCAL_JANUARY) {
        echo ", ";
    echo mcal_days_in_month($month, $isLeap);
echo " days in the months of " . $year;

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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