It contains an example vrest_start.php that will start a job via the rest api. Basically the simple example in PHP. In vrest_start.php I also added the code to log out. Could be useful if you want to use a linux scheduler. However it is still async. The task I get back from Enterprise manager just seems to "wait" (task status = finnished) until the backup command has been acknowledged by the backup server.
Long time I wrote this but reviewed it quickly. Basically it means you are successfully loading the guzzle library but nothing has happened yet
Make sure you have changed the username and password in the file because if the login fails, it won't do anything (if ($login != "") but no else statement saying something like "login failed")