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run code in 150+ php & hhvm versions
Bugs & Features
<?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() { echo 'test'; $this->count += 1; return $this; } public function getCount() { return $this->count; } } $counter = new EchoingCounter(new FluentCounter()); $counter = $counter->count()->count()->count()->count(); echo $counter->getCount();
based on i5m5r
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
EchoingCounter::count testtesttesttest4
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/iLGZY on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/iLGZY on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/iLGZY on line 2
Process exited with code 255.