How can I fix the Permission error when I call ses

Question

when I uploaded the script to the server I got this error

Warning: Unknown: open(/tmp/sess_58f54ee6a828f04116c2ed97664497b2, O_RDWR) failed: Permission denied (13) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

the error appeared when I call session_start(); although I set the permission of /tmp folder to 777 .

Answer 1

Add following line

ini_set('session.save_path', getcwd() . '/tmp');

before

session_start(); 

Answer 2

I had this problem in the following situation:

1. I filled some session vars with PHP
2. While the session was still active, I changed from PHP 5.4 to 5.3 on my host.
3. Reloading the page gave the error, described above.
4. Reset the PHP version to 5.4 again.
5. Used session_unset(); and session_destroy(); to clean the current session.
6. Changed the PHP version back to 5.3.
7. Now it works again.

Conclusion: For an irrelevant reason I had to change my PHP version, and while switching with sessions alive, the sessions get corrupted.

Answer 3

If :

• session.gc_probability > 0
• session files are created by different user(s) (e.g. root and apache).
• session files are all stored in the same place (e.g. /var/lib/php/session)

Then you'll see this error when e.g. the Apache PHP process attempts to run garbage collection on the session files.

Fixes :

1. Reconfigure PHP so gc_probability is 0, and have a cron job removing the old/stale file(s).
2. Have each different user save their session files in separate place(s) (session_save_path() etc).