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<?php $array = [ 'false' => false, 'null' => null, 'zero' => 0, 'empty' => '', ]; var_dump(isset($array['false'])); var_dump(isset($array['null'])); var_dump(isset($array['zero'])); var_dump(isset($array['empty']));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false) bool(true) bool(true)

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