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   1  <?php
   2  
   3  namespace Lcobucci\Clock;
   4  
   5  use DateTimeImmutable;
   6  use DateTimeZone;
   7  use function interface_exists;
   8  
   9  if (! interface_exists(Clock::class)) {
  10      interface Clock
  11      {
  12          /** @return DateTimeImmutable */
  13          public function now();
  14      }
  15  
  16      final class FrozenClock implements Clock
  17      {
  18          /** @var DateTimeImmutable */
  19          private $now;
  20  
  21          public function __construct(DateTimeImmutable $now)
  22          {
  23              $this->now = $now;
  24          }
  25  
  26          /** @return self */
  27          public static function fromUTC()
  28          {
  29              return new self(new DateTimeImmutable('now', new DateTimeZone('UTC')));
  30          }
  31  
  32          public function setTo(DateTimeImmutable $now)
  33          {
  34              $this->now = $now;
  35          }
  36  
  37          public function now()
  38          {
  39              return $this->now;
  40          }
  41      }
  42  
  43      final class SystemClock implements Clock
  44      {
  45          /** @var DateTimeZone */
  46          private $timezone;
  47  
  48          public function __construct(DateTimeZone $timezone)
  49          {
  50              $this->timezone = $timezone;
  51          }
  52  
  53          /** @return self */
  54          public static function fromUTC()
  55          {
  56              return new self(new DateTimeZone('UTC'));
  57          }
  58  
  59          /** @return self */
  60          public static function fromSystemTimezone()
  61          {
  62              return new self(new DateTimeZone(date_default_timezone_get()));
  63          }
  64  
  65          public function now()
  66          {
  67              return new DateTimeImmutable('now', $this->timezone);
  68          }
  69      }
  70  }