Here is a simple function to do that
//birthday YYYY-MM-DD
function userInfo($fname, $lname, $birthday) {
//Calc age
$age = date_diff(date_create($birthday), date_create('today'))->y;
return $fname ." ". $lname . " ".$age;
}
now call it
echo userInfo('John', 'Doe', '1986-02-01');
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solved PHP Date issues [duplicate]