help /tmp some how emptied all types of errors

for some reason it seems my /tmp folder is empty i dont know why but now i got all types of errors everywhere? is /tmp temporary files? noob in linux sorry

ps im running centos 5.4 and ispconfig2

pps: exact error

Warning: Unknown: open(/tmp/sess_bf5e7fdd04f8d7bc89caf90e845509fe, 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

 

You may try the following

1. set permission of /tmp as 777
2. restart ispconfig by
service ispconfig_server restart

 

1. chmod 777 /tmp?

 

Yes, that's right.

 

thank you so much