I am trying to add C:\\xampp\\php to my system PATH environment variable in Windows.
I have already added it using the Environment Varia
This only modifies the registry. An existing process won't use these values. A new process will do so if it is started after this change and doesn't inherit the old environment from its parent.
You didn't specify how you started the console session. The best way to ensure this is to exit the command shell and run it again. It should then inherit the updated PATH environment variable.