What to do if $_SESSION cannot get the value in php

Solution to the problem that $_SESSION cannot get the value in php: 1. Create the sessionDIR directory; 2. Change the directory permissions; 3. Open the php.ini configuration file and modify the configuration [session.use_cookies = 1]; 4. , restart apache.

Check the log error as follows:

[29-Apr-2013 16:32:14 PRC] PHP Warning:  session_start(): open(/tmp/sess_rkgh39rvdrqg5eij442u3mpvb5, O_RDWR) failed: Permission denied (13) in /var/www/html/marvin_au/module/userValidator.php on line 5

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Cause analysis:

All files under /tmp have been deleted before, resulting in the inability to obtain the SESSION value and the system being unable to log in.

Solution:

mkdir /usr/local/php/sessionDIR 
chmod 777 /usr/local/php/sessionDIR 
vim /usr/local/php/etc/php.ini 
session.save_path = "/usr/local/php/sessionDIR" 
session.use_cookies = 1 
session.use_trans_sid = 1

Finally just restart apache.

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