オライリージャパンによる Head First シリーズ デザインパターン（第2版）第14章 Builder パターンを、 PHPで書き直してみようという試みです。

AbstractBuilder.php

 
namespace Builder;

interface AbstractBuilder {

  public function buildDay(string $day) : void;
  public function addHotel(string $hotel) : void;
  public function addReservation(string $reservation) : void;
  public function addSpecialEvent(string $specialEvent) : void;
  public function addTickents(string $tickets) : void;
  public function getVacationPlanner() : Planner;

}
 

VacationBuilder.php

 
namespace Builder;

class VacationBuilder implements AbstractBuilder {

  protected Planner $vacation;

  public function __construct()
  {
      $this->vacation = new Planner();
  }

  public function buildDay(string $day) : void {

    $this->vacation->setBuildDay($day);

  }
  public function addHotel(string $hotel) : void {

    $this->vacation->setHotel($hotel);

  }

  public function addReservation(string $reservation) : void {

    $this->vacation->setReservation($reservation);

  }

  public function addSpecialEvent(string $specialEvent) : void {

    $this->vacation->setSpecialEvent($specialEvent);

  }

  public function addTickents(string $tickets) : void {

    $this->vacation->setTickents($tickets);

  }

  public function getVacationPlanner() : Planner {

    return $this->vacation;

  }

}
 

Planner.php

 
namespace Builder;

class Planner
{

  public ?string $day = null;
  public ?string $hotel = null;
  public ?string $reservation = null;
  public ?string $specialEvent = null;
  public ?string $tickets = null;

  public function setBuildDay(string $day) : void {

    $this->day = $day;

  }
  public function setHotel(string $hotel) : void {

    $this->hotel = $hotel;

  }

  public function setReservation(string $reservation) : void {

    $this->reservation = $reservation;

  }

  public function setSpecialEvent(string $specialEvent) : void {

    $this->specialEvent = $specialEvent;

  }

  public function setTickents(string $tickets) : void {

    $this->tickets = $tickets;

  }

}
 

index.php

 
use Builder\VacationBuilder;

$builder = new VacationBuilder();
$builder->buildDay('2022/04/01');
$builder->addHotel('ホテル');
$builder->addTickents('パークチケット');
$builder->addReservation('夕食');
$yourPlanner = $builder->getVacationPlanner();
var_dump($yourPlanner);

$builder = new VacationBuilder();
$builder->buildDay('2022/04/02');
$builder->addHotel('ホテル');
$builder->addSpecialEvent('パターンズオンアイス');
$builder->addReservation('夕食');
$yourPlanner = $builder->getVacationPlanner();
var_dump($yourPlanner);

$builder = new VacationBuilder();
$builder->buildDay('2022/04/03');
$builder->addHotel('ホテル');
$builder->addSpecialEvent('パターンズサーカス');
$builder->addReservation('夕食');
$yourPlanner = $builder->getVacationPlanner();
var_dump($yourPlanner);
 

出力結果

 
  object(Builder\Planner) (5) {
    ["day"]=>
    string(10) "2022/04/01"
    ["hotel"]=>
    string(9) "ホテル"
    ["reservation"]=>
    string(6) "夕食"
    ["specialEvent"]=>
    NULL
    ["tickets"]=>
    string(21) "パークチケット"
  }

  object(Builder\Planner) (5) {
    ["day"]=>
    string(10) "2022/04/02"
    ["hotel"]=>
    string(9) "ホテル"
    ["reservation"]=>
    string(6) "夕食"
    ["specialEvent"]=>
    string(30) "パターンズオンアイス"
    ["tickets"]=>
    NULL
  }

  object(Builder\Planner) (5) {
    ["day"]=>
    string(10) "2022/04/03"
    ["hotel"]=>
    string(9) "ホテル"
    ["reservation"]=>
    string(6) "夕食"
    ["specialEvent"]=>
    string(27) "パターンズサーカス"
    ["tickets"]=>
    NULL
  }