How to get number of days in a month and also knowing a leap year

[50r]

I am working on a tenance script that will need to know how many days are in the current month and also to check if the current february is not in a leap year. this is the code that i was trying to use but is there any better way to handle this?

$month = strftime('%m');
$year = strftime('%Y');
if ($month == 1 || $month == 3 || $month == 5 || $month == 7 || $month == 8 || $month == 10 || $month == 12) {
   $days = 31;
} elseif ($month == 4 || $month == 6 || $month == 9 || $month == 11) {
   $days = 30;
} elseif ($month == 2) {
   if(($year % 4 == 0) && ($year % 100 != 0) || ($year %400 == 0)) {
    $days = 28;
   } else {
    $days = 29;
   }
}
echo $days;

[scootstah]

Perhaps cal_days_in_month is what you're looking for.

[50r]

Thanks for the quick replay i also found this one which also works perfectly fine.

 

function get_days_in_month($month, $year)
{
  return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year %400 ? 28 : 29))) : (($month - 1) % 7 % 2 ? 30 : 31);
}

[jcbones]

I would suggest the DateTime Class.

[salathe]

As jcbones suggests, the DateTime class is your friend.  

 

// OOP style
$date = new DateTime;    // uses current date and time by default
echo $date->format('t'); // prints number of days in the month
echo $date->format('L'); // prints 1 if leap year, 0 otherwise

// Procedural style
$date = date_create();
echo date_format($date, 't');
echo date_format($date, 'L');

 

See the date() manual page for the meanings of the letters used with format().

Edited January 6, 2013 by salathe

[DavidAM]

$days = date('d', mktime(0, 0, 0, $month + 1, 1, $year) - 1)

[salathe]

$days = date('d', mktime(0, 0, 0, $month + 1, 1, $year) - 1)

 

Why would anyone choose to do that? There are several "huh, wha, why?" points in that single line of code.

[Barand]

simpler, if you don't use datetime object, is

 

$days = date('t', mktime(0,0,0,$month,1,$year));

[haku]

I'm still not sure what the OP was asking. Do they want to know how many days there are in the current month, or do they want to know whether or not the current year is a leap year? And if they want to know both, then how do these two things relate to each other?

[scootstah]

I'm still not sure what the OP was asking. Do they want to know how many days there are in the current month, or do they want to know whether or not the current year is a leap year? And if they want to know both, then how do these two things relate to each other?

 

I believe he only wanted to know about leap year so that he could determine if February had 28 or 29 days. However, several PHP functions already handle that logic, so it's sort of irrelevant.

[50r]

I believe he only wanted to know about leap year so that he could determine if February had 28 or 29 days. However, several PHP functions already handle that logic, so it's sort of irrelevant.

 

what i was trying to ask was, i am working on a system that will manage tenants so tenant on their registration, need to pick a subscription cycle which can be monthly,quarterly semi-annuall, and annualy.

 

what i did not know is that there were such simple functions like mktime and the date(t) format. But my intent in this question was the ability to add up a three or six or monthly cycle regardles of the numbers in the month but just bind it all in just a simple variable monthy, quarterly and soo on.

 

thanks to you guy good bless.

"RIP Steve jobs"

.

[Christian F.]

For something like that PHP has a really nifty thing called "relative date formats", which makes it extremely easy to add any amount of interval to a time/date.

They can be used with either the DateTime class, or the strototime () function. I recommend the former, as it's more future proof.

[50r]

thanks chris