There is no official product called "Ioncube Decoder." The company IonCube produces the Encoder (to protect code) and the Loader (to run the code). Version 12 was a major release that added support for PHP 8.1 .
If you own a script but cannot see inside a specific function: Ioncube Decoder 12
Running the encoded script in a controlled environment to intercept the raw PHP code right before it executes. There is no official product called "Ioncube Decoder