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<?php $path = 'a'; $pathParts = array_pad(explode('/', $path), -2, 'root'); var_dump($pathParts);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(4) "root" [1]=> string(1) "a" }