/**
* Download a file to the filesystem.
*
* @param string $url
* @param string $filename
* @param array $options
* @param bool $async
*
* @throws Exception
*
* @return Curl
*/
public static function download($url, $filename, $options = [], $async = false)
{
$fp = fopen($filename, 'w');
if ($fp === false) {
throw new Exception('Unable to write to "' . $filename . '"');
}
flock($fp, LOCK_EX);
$defaults = self::defaults(array(CURLOPT_URL => $url, CURLOPT_RETURNTRANSFER => false, CURLOPT_FILE => $fp));
$response = new self($options + $defaults);
$response->on('load', function () use($fp) {
fflush($fp);
flock($fp, LOCK_UN);
});
$deleteFile = function () use($filename, &$fp) {
flock($fp, LOCK_UN);
fclose($fp);
unlink($filename);
$fp = fopen('php://memory', 'w');
};
$response->on('abort', $deleteFile);
// Override default error handle
$response->onError = function ($message, $options) use($deleteFile) {
$deleteFile();
throw new InfoException($message, $options);
};
$response->on('closed', function ($response) use(&$fp) {
fclose($fp);
});
if ($async == false) {
$response->waitForCompletion();
}
return $response;
}
