在Ajax调用中执行的php函数有访问会话变量的权限吗?

There is a list of events that are listed on a website. The date and time for the events are in UTC in the database. Whenever a user accesses the website we store his time offset in php session and then show him the time and date of the event in his timezone. There is a payment gateway to book the event and I am trying to send an email as soon as the payment is made. There are two ways I can do it.There is a list of events that are listed on a