php | destroy/delete all sessions

I recently searched for an option deleting all running/active sessions,

for changing some important logic on my server.

Important:

just restarting apache won't help!

because php handles php-sessions by itself.

now,

I wonder how to make it, without changing php code.

The solution, is to delete the PHP session files created by PHP engine.

Step #1 - find where PHP store php files

on php.ini there is configured session.save_path 

which points to the correct path.

by default, it configured to "" (empty), and it is:

• On Ubuntu or Debian machines: saved on /var/lib/php5
  
• On RHEL and CentOS systems: saved on /var/lib/php/session
• If you need to find it: print session_save_path() on your php file.    You may run from command line:  php -r 'echo session_save_path(), "\n";'

Step #2 - just delete the files

Execute the following bash script:

rm  -f   /var/lib/php/session/*

or
rm  -f   /var/lib/php5/sess*

(-f will force delete without prompting!!) 

And that's it...

Now when a user will execute web-request, 

his session will be considered empty, 

and will be re-generated (under the same session name)