Is it possible to make some part of the php code encrypted or in the dll file? I want to hide some part of the code
The best encryption module which is used millions of online web scripts is IonCube it is also the only one that has not been unencrypted in some way. PHP as it is server side is able to be encrypted however any html, css, javascript can be obfuscated but not encrypted.
As mentioned, IonCube and Zend are the two most popular. I know have been able to deZend files with ease, but IonCube files seem a bit more secure.