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<?php class C { protected $counter = 0; public function __invoke() { $counter++; return $this; } public function __toString() { return (string) $this->counter; } } $c = new C; echo ($c())();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $counter in /in/5GCP0 on line 4 Warning: Undefined variable $counter in /in/5GCP0 on line 4 0

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