encryption - Encoding PHP source codes

I've developed a PHP application based on codeigniter framework that took me more than 8 months to do it now I want to encode it so that no one can just copy and change configuration and deploy it somewhere else without consulting me so I was wondering if there are ways of encoding PHP files without installing any additional software in the server side. Any help will be appreciated

Answer

Most stable solutions are from Zend ($799), IonCube ($199 - $348),

SourceGuardian ($250) and PHPShield ($99).
Source

or see this article, inlcuding free encoders:
link

Harry