builder-pattern-implemented

Device.php

<?php

class Device
{
  private $kind;
  private $os;
  
  public function __construct($kind, $os)
  {
    $this->kind = $kind;
    $this->os = $os;
  }
  
  public function kind()
  {
    return $this->kind;
  }
  
  public function os()
  {
    return $this->os;
  }
}

DeviceBuilder.php

<?php

class DeviceBuilder
{
  private $devicesDatabase;
  private $userAgent;
  
  public function __construct($devicesDatabase)
  {
    $this->devicesDatabase = $devicesDatabase;
  }
  
  public function setUserAgent($userAgent)
  {
    $this->userAgent = $userAgent;
  }
  
  public function build()
  {
    // perform all the retrieval from $this->devicesDatabase before creating
    // the instance of Device to return
  }
}

script.php

<?php

// Usage...

$deviceBuilder = new DeviceBuilder(
  new DeviceDatabase()
);

$deviceBuilder->setUserAgent($_SERVER['HTTP_USER_AGENT']);

$device = $deviceBuilder->build();