Because PHP 7.0 has reached its end-of-life, it is no longer featured on the main XAMPP landing page. To find it, you must use the official community archives:
For Windows users seeking a mirrored repository, Uptodown hosts a version history that includes several legacy installers. Why Use PHP 7.0 Today? xampp old version php 7.0 download
It is a best practice to ensure your local development environment matches your production server as closely as possible to avoid unexpected bugs during deployment. Installation Steps for Older XAMPP Versions Download XAMPP Because PHP 7