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Set up a development environment with multiple PHP versions using Docker

Since I've moved away from PHP I did not work on it much. Lately, however, I had to touch an old project (using PHP 5.6) and a new one in 7.4. I got a new Apple laptop (an M1) and I had no intention to spend time installing different versions of PHP, so instead I made a small service using Docker to have a ready environment to work o