IonCube v10.x (released ~2017–2018) officially supported PHP versions from 5.3 to 7.1. According to IonCube documentation:
Decoding software often violates the End User License Agreement (EULA) of the original developer. ioncube decoder v10x php 56
Given the advancements in PHP and changes in the web development landscape, it's generally recommended to: IonCube v10