Get users mySql

Hi,
Would like to know if someone can said me if its possible to get all users of MySQL using PHP.
I’m using Varest Plugin , I did the login system and i’m still a newbie in PHP. I can receive data for one user but not for all .
That’s an example of what I make :

In Unreal when i call the event who make the ProcessRequest , I receive the log JSON with all users data but only in outputLog.

When i try to print the ‘Get Response Content as String’ the result is ‘{}’ , totally empty with an error :
“LogVaRest: Error: UVaRestJsonObject::SetRootObject(45): Trying to set invalid json object as root one. Reset now.”

If someone have an idea , would be great , and sorry for my english !

THX

You may need to contact the VaRest plugin’s developer for this one.

I already solve my problem with the Plugin and the PHP, but thanks for the tips ^^