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1. Login to shell prompt with user credentials (which allows you to install stuff on server).
2. Execute command yum update “*php*”
3. This should update all PHP related components to the latest version. (Assuming you installed yum etc., on CentOS)
4. Once done that, You will require to install Pear based JSON support by following command.
5. pecl install json
6. This will install JSON, simply wait and cross your fingers! If it says OK in last 2 lines, everything is fine so far.
7. You will also require to enable JSON support in php.ini
8. Smart way to do that is, create a new file in /etc/php.d/ called json.ini
9. The file should contain this line: extension=json.so
10. Finally, restart the HTTP (Apache) Server by command: service httpd restart

Done! Here is the all keyboard actions together, after you logged in:

yum update “*php*”
pecl install json
cd /etc/php.d/
echo “extension=json.so” >> json.ini
service httpd restart