PHP download/collect remote images to local

/**
 * Download remote images to local
 *
 * @param string $url remote file address
 * @param string $filename 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 (the rest of the path is automatically generated based on the time system)
 * @param int $type The way to obtain the file remotely
 * @return json Returns the file name , file saving path
 * @author blog.snsgou.com
*/
function download_image($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 the file type
 $suffix = substr(strrchr($url, '.'), 1);
 if (!in_array($suffix, $fileType))
 {
 return false;
 }

 // Set the saved file name
 $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 . '/' . date('Y', time()) . '/' . date('m', time()) . '/' . date('d', time());
 $dirName = $dirName . '/' . date('Ym', time());
 if (!file_exists($dirName))
 {
 mkdir($dirName, 0777, true);
 }

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

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

PHP