Curl\Curl::progress PHP Method

    public function progress($callback)
    {
        $this->setOpt(CURLOPT_PROGRESSFUNCTION, $callback);
        $this->setOpt(CURLOPT_NOPROGRESS, false);
    }

<?php

require __DIR__ . '/vendor/autoload.php';
use Curl\Curl;
$curl = new Curl();
$curl->progress(function ($client, $download_size, $downloaded, $upload_size, $uploaded) {
    if ($download_size === 0) {
        return;
    }
    $percent = floor($downloaded * 100 / $download_size);
    echo ' ' . $percent . '%' . "\r";
});
$curl->download('https://secure.php.net/distributions/manual/php_manual_en.html.gz', '/tmp/php_manual_en.html.gz');