Reconstructing bytecode back into readable PHP 8.1 code requires: Manual reconstruction of loops, conditions, and variables.
Some developers have created custom decoders that combine multiple decoding cores. One example is a decoder built with seven decoding cores: five cores for decrypting IonCube (PHP 5.2 and 5.3) and Zend Guard (PHP 5.2), one core for Zend Guard (PHP 5.3), and an older universal decoder for Base64 and other encryption types.
The Myth and Reality of ionCube Decoders for PHP 8.1: A Comprehensive Guide