PHP function that returns the exact age

Here is a simple PHP function that returns the exact age of a person given his/her birthdate: function age($month, $day, $year){ $y = gmstrftime("%Y"); $m = gmstrftime("%m"); $d = gmstrftime("%d"); $age = $y - $year; if($m <= $month) { if($m == $month) { if($d < $day) $age = $age - 1; } else $age = […]

Here is a simple PHP function that returns the exact age of a person given his/her birthdate:

function age($month, $day, $year){
 $y = gmstrftime("%Y");
 $m = gmstrftime("%m");
 $d = gmstrftime("%d");
 $age = $y - $year;
 if($m <= $month)
 {
 if($m == $month)
 {
 if($d < $day) $age = $age - 1;
 }
 else $age = $age - 1;
 }
 return($age);
}

The function is used with a call like this:

age(2,1,1979);

The example call would return 30 (at this moment). You can use this to display the age of your users if you have their birthdate.

Enjoy!

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Mary Lou (Manoela Ilic) is a freelance web designer and developer with a passion for interaction design. She studied Cognitive Science and Computational Logic and has a weakness for the smell of freshly ground peppercorns.

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Website: http://tympanus.net/

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  1. Pingback: PHP function that returns the exact age

  2. 1

    $intCurrentDateStamp = time();
    $intBirthStamp = mktime( 0, 0, 0, 12, 24, 1986 );
    $intAge = $intCurrentDateStamp – $intBirthStamp;
    echo round( ( ( ( ( $intAge / 60 ) / 60 ) / 24 ) / 365 ) );

  3. 2

    The code from Mary is a bit complicated and is wrong (if the locale is not GMT it might produce false result).

    The code from Adam is wrong as well as it doesn’t take leap years into account.

    function age($year, $month, $day) {
    $y = date(‘Y’);
    $m = date(‘m’);
    $d = date(‘d’);

    $age = $y – $year;

    if( ($m < $month) || ($m == $month && $d < $day) )
    {
    $age–;
    }

    return $age;
    }

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