Use vi editor to open php5’s php.ini file at ubuntu or any debian based os:
Root login to your VPS then write the command
sudo vi /etc/php5/apache2/php.ini
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To save this change:
ESC
shift >colon : >wq
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Exit without save:
ESC
shift >colon : >q!
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Restart web server to perform the changes:
sudo service apache2 restart
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