Instead of decoding, understand the behavior via execution logs, then rebuild from scratch. This is 100% legal and safe.
Decoding bytecode to high-level PHP is not like unzipping a file. Bytecode strips away comments, meaningful variable names (replacing them with $var_1 , $var_2 ), and logical structure. Even if you could decode the file, you would get something like this: decode ioncube online full
If you control the code or have legitimate access, here are lawful, constructive alternatives: Instead of decoding, understand the behavior via execution