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<?php function config($key): string { $arr = ["protocol"=> "https", "port"=> "80", "website"=>"wwww.example.com"]; return array_key_exists($key, $arr) ? $arr[$key] : null; } function myfunc(callable $configAccessor){ echo $configAccessor("port"); } myfunc('config');
Output for git.master, git.master_jit, rfc.property-hooks
80

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