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<?php $x = function (array $a) {}; $rf = new ReflectionFunction($x); $p = $rf->getParameters(); var_dump($p[0]->isArray());
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Method ReflectionParameter::isArray() is deprecated in /in/pgMuD on line 7 bool(true)

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