I have been checking the PHP session functions and I saw session_abort().
What is the purpose of using session_abort()?
What is the difference between session_abort() and session_destroy()?
session_abort() is analogous to session_write_close().
PHP locks session data during a web request to prevent data corruption on multiple simultaneous requests.
When Request 1 comes in, Session 1 is locked by that process so it can make any changes needed. If Request 2 comes in for Session 1, php blocks until the session lock is released to make sure that Request 2 has the most up-to-date session data.
session_abort() closes the session and releases the lock without flushing session data to the session storage mechanism while session_write_close() writes the current content of session back and then closes / releases the lock.
Calling session_abort() or session_write_close() will let php process Request 2 even if Request 1 is not finished processing.