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<?php class A { public function __invoke() { return "hello"; } } $a = new A; var_dump(is_callable($a)); function my_echo(callable $a) { echo $a() . PHP_EOL; var_dump($a instanceof A); } my_echo($a);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) hello bool(true)

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