gistfile1.php

// Immutable class
class Person {
  private $name;
  
  public function __construct(string $name) {
    $this->name = new Name($name);
  }
  
  public function rename(string $name) {
    $this->name->rename($name);
  }
  
  public function name() {
    return $this->name->toString();
  }
}

// Immutable and constant class
class Money {
  private $value;
  
  public function __construct(int $value) {
    $this->value = $value;
  }
  
  public function toValue() {
    return $this->value;
  }
}