PHP Get Age Function

Posted on February 5, 2008 in Tutorial | 4 Comments »

Such things like copyright dates, ages, etc. can cause problems on websites unless they are dynamic. For example, I have my age in the little about me blurb in the sidebar. I made a little function to calculate my age so that I don’t have to go in every year on my birthday and add another year to my age.

The Function

function age($bMonth,$bDay,$bYear) {

	$cMonth = date('n');
	$cDay = date('j');
	$cYear = date('Y');

	if(($cMonth >= $bMonth && $cDay >= $bDay) || ($cMonth > $bMonth)) {
		return ($cYear - $bYear);
	} else {
		return ($cYear - $bYear - 1);
	}
}

This function takes 3 arguments: the birth month, the birth day, and the birth year. It will return the calculated age. It obviously won’t work with an age in the future; it will return a negative number. I could add in checking to see if it’s a valid date, but I don’t think it’s really necessary.

Check Out Some Examples

Nothing too complicated. Let me know if anyone has any suggestions to shorten the code.

Share This:

Grab the RSS feed of comments for this entry

4 Responses

KaimiteMarch 10, 2008 at 5:36 am

Hello :

Here is 2 suggestions :

function age2($bDate) {
	list($bYear, $bMonth, $bDay) = explode("-", $bDate);
	list($cYear, $cMonth, $cDay) = explode("-", date("Y-m-d"));
	return ( ($cMonth >= $bMonth && $cDay >= $bDay) || ($cMonth > $bMonth) ) ? $cYear - $bYear : $cYear - $bYear - 1;
}

echo age2("1978-01-14");

function age2($bMonth,$bDay,$bYear) {
	list($cYear, $cMonth, $cDay) = explode("-", date("Y-m-d"));
	return ( ($cMonth >= $bMonth && $cDay >= $bDay) || ($cMonth > $bMonth) ) ? $cYear - $bYear : $cYear - $bYear - 1;
}

echo age2(1,14,1978);

See you.

Kaimite

Sony AKJune 19, 2008 at 3:22 am

Great post :) i’m using it :)
Matthew PennellJune 21, 2008 at 10:45 am

Sorry for the much delayed comment, but how about this much simpler solution:

echo intval((time() - strtotime(‘14-01-1978’)) / 31557600);

It will tick over at some point during the day of your birthday, as it uses an approximation of a year (365.25 days to represent a partial leap-year).
How to take out user's AGE in PHP? - DesignersTalkSeptember 12, 2008 at 5:19 pm

[…] this PHP Get Age Function | Trevor Davis My-PHP.tk ••• Your Free PHP Resource! ••• […]