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run code in 200+ php & hhvm versions
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<?php $perm=47; $test=explode(".", $perm/64); var_dump($test); var_dump($perm);
Output for 4.3.0 - 7.2.0
array(2) { [0]=> string(1) "0" [1]=> string(6) "734375" } int(47)