I'm creating an admin class and i need to know how to auto instantiating the class vars

    class Admin{


        public $admin_id ;
        public $admin_name ;
        public $admin_email ;
        public $admin_type ;
        public $admin_password ;

        // methods goes here


    }

        $admin = new Admin();
        $class_vars = get_class_vars(get_class($admin));

        foreach ($class_vars as $name => $value) {
                 echo "$name : $value<br />";
             }

in some of lynda tutorial (php beyond the basic ) you have to create couple of methods so you can instantiation the class vars using mysqli

private static function instantiation($database_row){

        $object = new self ; 

        foreach($database_row as $attribute => $value){

            if($object->has_attribute($attribute)){

                $object->$attribute = $value ;

            }

        }
        return $object;

    }

private function  has_attribute($attribute){

$object_properties = get_object_vars($this);
return array_key_exists($attribute,$object_properties);
}

but i need to use the pdo instead of mysqli