Added the session status judgment function in php5.4.

In php5.4, the new function for judging session status was added. in the previous php version, to determine whether the session is valid, you can only use the following method :? Java code ?? Session_start ();???????? If (isset ($ _ SESSION ))???? {??????? Echo? "Added the session status judgment function in php 5.4.

In previous php versions, you can only use the following method to determine whether the session is valid :?

Java code ??

1. Session_start ();??
2. ????
3. ?? If (isset ($ _ SESSION ))??
4. ?? {???
5. ???? Echo? "Started ";??
6. ??}??
7. ?? Else ??
8. ?? {??
9. ???? Echo? "Not? Started ";??
10. ??}??

?? In php 5.4 (coming soon), the session status is subdivided and can be determined using the following method :?

Java code ??

1. Session_start ();??
2. ????
3. ?? $ Status? =? Session_status ();??
4. ????
5. ?? If ($ status? ==? PHP_SESSION_DISABLED )??
6. ?? {??
7. ???? Echo? "Session? Is? Disabled ";??
8. ??}??
9. ?? Else? If ($ status? ==? PHP_SESSION_NONE ?)??
10. ?? {??
11. ???? Echo? "Session? Enabled? But? No? Session? Values? Created ";??
12. ??}??
13. ?? Else ??
14. ?? {??
15. ???? Echo? "Session? Enabled? And? Session? Values? Created ";??
16. ??}??

? We can see that the result returned by using session_status () is an int type value, indicating the various statuses of the session, such as disabling (PHP_SESSION_DISABLED). Does the session still exist?
(PHP_SESSION_NONE )?
Or the session has been established (PHP_SESSION_ACTIVE )?