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 10 month : 30
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

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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