SourceGuardian is the leading provider of PHP encoding and obfuscation products. Their tools protect your code by encrypting it and making it unreadable by humans. They also provide a service to decode your code if you ever need to make changes to it.
There are a few different companies that offer sourceguardian decoder services. These services typically allow you to upload a file that is encoded with sourceguardian, and then they will provide you with a decoded version of the file. This can be helpful if you need to access the source code of a file but do not have the sourceguardian encoding software.
Overall, the sourceguardian decoder services provide a great way to decode your PHP files so that you can protect your code. They offer a variety of services, including a free trial, so you can try them out before you commit to using their services. I would recommend their services to anyone looking to protect their PHP code.