PHP code cannot protected directly. You have to extract important code parts from PHP and place the code into a DLL. Then you protect the DLL with Licence Protector 5. The DLL can be written with any compiler. If you would directly address the Licence Protector 5 DLL, a hacker could remove the DLL commands.
Another option is to compile PHP to an EXE file. There are different tools which offer this option. Then All-In-One Protector can be used.
How to reference a DLL from PHP see http://www.php.net/manual/en/ref.com.php
See also: Server Application, Service, Web Application
To protect the code against de-compilation or reverse engineering, you can combine Licence Protector with All-In-One Protector for a special bundle price.
See chapter: Code Protection / Decompile Protection