PHP gets a specific number of days per month

Method 1:

$firstday Mktime (0,0,0,$month, 1,$year// the Unix timestamp for the    first day of the given month $daysdate(' T ',$firstday// Returns the number of days  in the specified month

Method 2:

$days Cal_days_in_month (Cal_gregorian, 4, 2013); // returns 2003-02 of the  number of days

Method 3:

$days Date Strtotime ($year$month . '-01 ')); //

Method 4:

$ndays Date // return   the number of days for this month and this year Date ("J",mktime(0,0,0,$month+1,0,$year

PHP gets a specific number of days per month