[PHP]Session執行步驟

When session_start() is called:
open
read
clean (if cleaning is being done this call)
write
close

When session_destroy() is called after session_start():
open
read
clean (if cleaning is being done this call)
destroy
close

When session_regenerate_id(1) is called after session_start():
open
read
clean (if cleaning is being done this call)
destroy
write
close