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<?php interface Counter { /** @return self */ public function count(); /** @return int */ public function getCount(); } class ImmutableCounter implements Counter { private $count; public function __construct($count = 0) { $this->count = (int) $count; } public function count() { return new ImmutableCounter($this->count + 1); } public function getCount() { return $this->count; } } $counter = new ImmutableCounter(); $counter = $counter->count()->count()->count(); echo $counter->getCount();
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