Translate array php

<?php
//https://github.com/Stichoza/google-translate-php
require 'vendor/autoload.php';

$src = [];

use Stichoza\GoogleTranslate\TranslateClient;

$tr = new TranslateClient('en', 'pt');

function trans($val) {
    global $tr;
    usleep(200);
    return is_array($val) ? array_map('trans', $val) : ucfirst($tr->translate($val));
}

$ret = array_map('trans', $src);

header('content-type: text/plain');

var_export($ret);

?>