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<?php $refVariable = false; $refName = 'refVariable'; $callback = function() use (&$refVariable) {}; $function = new \ReflectionFunction($callback); $staticVariables = $function->getStaticVariables(); var_dump(array_key_exists($refName, $staticVariables)); var_dump($refVariable); $staticVariables[$refName] = true; var_dump($refVariable);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false) bool(true)

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