Руководство по PHP
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cal_days_in_month

(PHP 4 >= 4.1.0, PHP 5)

cal_days_in_month -- Return the number of days in a month for a given year and calendar

Description

int cal_days_in_month ( int calendar, int month, int year )

This function will return the number of days in the month of year for the specified calendar.

Пример 1. cal_days_in_month() example

<?php
$num = cal_days_in_month(CAL_GREGORIAN, 8, 2003); // 31
echo "There was $num days in August 2003";
?>

See also jdtounix().

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Calendar FunctionsУровень вышеcal_from_jd