calculate person age by birthdate php

 public function getAge($date)
    {
        
        $dob = new DateTime($date);
        
        $now = new DateTime();
         
        $difference = $now->diff($dob);
         
        $age = $difference->y;
         
        return  $age;
    }function get_age( $date ) { 
    $age = date('Y') - $date; 
   if (date('md') < date('md', strtotime($date))) { 
       return $age - 1; 
   } 
   return $age; 
}