php calculate how many days in a month

php calculates the number of days in a month

Format:

cal_days_in_month 的公用:返回某个历法中某年中某月的天数

Parameter introduction ：

cal_days_in_month($par1,$par2,$par3);

$par1: A certain calendar used for calculation, PHP Calendar constant

$par2: Parameter $par1 selects a certain month in the calendar

$par3: Select a certain year in the calendar

Return value:

$par1 Select the number of days in a certain year and month in the calendar

PHP Calendar Constants: The calendar extension contains functions that simplify conversion between different calendar formats.

In order for these functions to work, you must compile PHP with --enable-calendar. Under window, support for calendar extension has been integrated

The constant CAL_GREGORIAN in the case is a predefined constant of PHP, just like PHP_OS and other constants

gregorian means: Gregorian calendar; Gregorian Calendar

Example:

<?php 
    $days = cal_days_in_month(CAL_GREGORIAN, 4, 2011);
    echo "返回2011-4的天数 ".$days."<br/>";
    $days = date(&#39;t&#39;, strtotime("2011-4-1"));
    echo "返回2011-4的天数 ".$days."<br/>";
    $days = date("t"); 
    echo "当前月的天数 ".$days."<br/>";
?>

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