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run code in 200+ php & hhvm versions
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<?php $var = 'test'; $var2 = 'test2'; $func = function()use($var,$var2) { echo $var; }; $ref = new ReflectionFunction($func); var_dump($ref); $functionParameters = []; var_dump($ref->getStaticVariables());
based on auvAM
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0rc3
object(ReflectionFunction)#2 (1) { ["name"]=> string(9) "{closure}" } array(2) { ["var"]=> string(4) "test" ["var2"]=> string(5) "test2" }
Output for hhvm-3.15.4
object(ReflectionFunction)#2 (3) { ["name"]=> string(9) "{closure}" ["closure":"ReflectionFunction":private]=> object(Closure$;1465325131$cde1ce98049903fe172db06e0592a099$)#1 (1) { ["static"]=> array(2) { ["var"]=> string(4) "test" ["var2"]=> string(5) "test2" } } ["params":"ReflectionFunctionAbstract":private]=> NULL } array(2) { ["var"]=> string(4) "test" ["var2"]=> string(5) "test2" }