Age calculator

This function will take a birthday and calculate an age.

 

<?php function birthday($birthday){
    $age = strtotime($birthday);
    if($age === false){
        return false;
    }
    list($y1,$m1,$d1) = explode("-",date("Y-m-d",$age));
    $now = strtotime("now");
    list($y2,$m2,$d2) = explode("-",date("Y-m-d",$now));
    $age = $y2 - $y1;
    if((int)($m2.$d2) < (int)($m1.$d1))
        $age -= 1;
    return $age;
}

echo birthday('1986-07-22'); ?>