PHP: Property Accessors Example Person Version 1

php_property_accessors_person_ver1.php

<?php
class Person {

  public $first_name;
  public $last_name;

  public function __construct($first_name, $last_name)
  {
    $this->first_name = $first_name;
    $this->last_name = $last_name;
  }

  public function full_name()
  {
    return $this->first_name.' '.$this->last_name;
  }

}
$me = new Person("Simeon", "Willbanks");
// Why does this have to be a function?
// Why can't it be a member?
echo $me->full_name();