Sorry for the delay
I was not able to work on this issue again until now.
Yes, the non-Zend PHP applications also connect to oracle database but they don't generate this information.
I work on Oracle Support but rhere isn't any information about this problem on our knowledge database and unfortunately there is few information about Zend connection. I have open this thread to know if anyone could help us to know the differences between this connections which could help us to identify the cause.
what is the difference between these connections?