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\OC\Files\View::createParentDirectories was previously prone to an endless loop. If a path such as /foo/existingfile.txt/bar/foo was passed and existingfile.txt existed in foo the loop was never left and running until the PHP process timed out. This commit changes the logic to a foreach loop over an array and additionally additional error handling using is_file. Signed-off-by: Lukas Reschke <lukas@statuscode.ch>