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<?php interface Counter { /** @return self */ public function count(); /** @return int */ public function getCount(); } class EchoingCounter implements Counter { private $counter; public function __construct(Counter $counter) { $this->counter = $counter; } public function count() { echo __METHOD__ . "\n"; return $this->counter->count(); } public function getCount() { echo __METHOD__ . "\n"; return $this->counter->getCount(); } } class FluentCounter implements Counter { private $count = 0; public function count() { $this->count += 1; return $this; } public function getCount() { return $this->count; } } $counter = new EchoingCounter(new ImmutableCounter()); $counter = $counter->count()->count()->count()->count(); echo $counter->getCount();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Class "ImmutableCounter" not found in /in/9b6Eg:52 Stack trace: #0 {main} thrown in /in/9b6Eg on line 52
Process exited with code 255.

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