How to capture a dynamic session id out of php/ajax app.

Hi All,

Recently, I have been asked to load test few scenarios on Moodle based LMS and one of the scenario talks about creating users from the 'Create Users' page. Now, what is actually happening - after am done with filling in required data and click over the submit button, there's a dynamic session ID getting generated. How to capture this dynamic session id while the script is running and complete my aim!

Any help would be appreciated, feel free to revert back with queries!

Thanks,