How To Run Multiple PHP Versions on One Server Using Apache and PHP-FPM

The [Apache](https://httpd.apache.org/) web server uses virtual hosts to manage multiple domains on a single instance. Similarly, [PHP-FPM](https://php-fpm.org/) uses a daemon to manage multiple PHP versions on a single instance. In this tutorial we'll use Apache and PHP-FPM to host multiple PHP web-applications, each using a different version of PHP, all on the same server, and all at the same time.

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