Improved support for PHP files (array notation & string concatenation)

You can now use also array(...) notation for your PHP files and concatenate strings.

<?php

return array(
  "key" => "Translation" . " " . "made" . " of " . "more strings",
  "nested" => [
    "key" => "You can combine array() and []"
  ]
);

Note: It’s not possible to concatenate variables.