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<?php function a(callable $callback) { } $r = new ReflectionFunction('a'); var_dump($r->getParameters(), $r->getParameters()[0]->isCallable());
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Method ReflectionParameter::isCallable() is deprecated in /in/eDZdO on line 8 array(1) { [0]=> object(ReflectionParameter)#2 (1) { ["name"]=> string(8) "callback" } } bool(true)

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