Method on null object working.php

<?php

class Person {
  public $name;

  public function __construct($name) {
    $this->name = $name;
  }

  public static function getName(Person $p = NULL) {
    if (!isset($p)) {
      return "Anonymous";
    }
    else {
      return $p->name;
    }
  }
}

function main() {
  $p1 = new Person('Nemo');
  $p2 = NULL;

  var_dump(Person::getName($p1), $p2, Person::getName($p2));
}

main();

/* Result: 

string(4) "Nemo"
NULL
string(9) "Anonymous"

*/