cal_days_in_month: Number of days in a given month

$days = cal_days_in_month(CAL_GREGORIAN, 4, 2013);
echo "Number of days in  April  2013 = $days";

The output is here

Number of days in April 2013 = 30

Syntax is here:

cal_days_in_month(type of calendar, month, year )

Number of days in present month

There is a better way to get the number of days in present month by using date formats. Here is the code

echo date('t');

The output is here

Number of days in next month

We can read the present month and present year by using date() function. Then we will 1 to present month to get next month and then get the number of days in that month.

$m= date('m');// Present Month
$y= date('Y'); // Preseent year
$no_of_days = date('t',mktime(0,0,0,$m+1,1,$y)); 
// This is to calculate number of days in next month
echo " Number of days in Next to $m month :$no_of_days";

The output is here Number of days in Next to 09 month : 31
You can read more on date format here

Number of days in previous month

From the present month we can subtract 1 to get previous month

$no_of_days = date('t',mktime(0,0,0,$m-1,1,$y)); 
// to calculate number of days in previous month

strtotime: to get Date formats from a string input
Calendar Functions

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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Number of days in any given Month

Number of days in present month

Number of days in next month

Number of days in previous month

Subhendu Mohapatra