Guzzle 6 download file
Just do research inside Guzzle's docs, for example here
Pass a string to specify the path to a file that will store the contents of the response body:
$client->request('GET', '/stream/20', ['sink' => '/path/to/file']);
Pass a resource returned from fopen() to write the response to a PHP stream:
$resource = fopen('/path/to/file', 'w');
$client->request('GET', '/stream/20', ['sink' => $resource]);
Pass a Psr\Http\Message\StreamInterface object to stream the response body to an open PSR-7 stream.
$resource = fopen('/path/to/file', 'w');
$stream = GuzzleHttp\Psr7\stream_for($resource);
$client->request('GET', '/stream/20', ['save_to' => $stream]);
stream_for
is deprecated in version 7.2. You can use
GuzzleHttp\Psr7\Utils::streamFor($resource)
instead.