/**
 * Collect remote pictures
 * @param string $url remote file address
 * @param string $filename The saved file name (if empty, it is a randomly generated file name, otherwise it is the original file name)
 * @param array $fileType allowed file types
 * @param string $dirName The path where the file is saved
 * @param int $type How to obtain files remotely
 * @return json Returns the file name and file saving path
 */
function download_image($url, $fileName = '', $dirName, $fileType = array('jpg', 'gif', 'png'), $type = 1)
{
    if ($url == '')
    {
        return false;
    }

    // Get the original file name of the file
    $defaultFileName = basename($url);

    // Get file type
    $suffix = substr(strrchr($url, '.'), 1);
    if (!in_array($suffix, $fileType))
    {
        return false;
    }

    //Set the file name after saving
    $fileName = $fileName == '' ? time() . rand(0, 9) . '.' . $suffix : $defaultFileName;

    // Get remote file resources
    if($type)
    {
        $ch = curl_init();
        $timeout = 30;
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        $file = curl_exec($ch);
        curl_close($ch);
    }
    else
    {
        ob_start();
        readfile($url);
        $file = ob_get_contents();
        ob_end_clean();
    }

    //Set file saving path
    $dirName = $dirName;
    if (!file_exists($dirName))
    {
        mkdir($dirName, 0777, true);
    }

    // save file
    $res = fopen($dirName . '/' . $fileName, 'a');
    fwrite($res, $file);
    fclose($res);

    return array(
        'fileName' => $fileName,
        'saveDir' => $dirName
    );
}