During my mock Zend PHP certification exams I have came across the following question that I have researched online but have not found a definitive, and understandable, answer to them. Can anyone advise what the answers to these may be or point me in the right direction?
Consider 3 PHP files that are called asynchronously via XmlHttpRequest:
Which of the following statements is true? (Choose two.)
A. The total execution time for all 3 requests will be the maximum of the longest sleep() call
B. The requests may be processed out of order
C. The requests are guaranteed to be executed in order
D. Concurrent requests will be blocked until the session lock is released
Тhank you in advance.