My friend - and PHP Community Old Guard - Ben (@ramsey) Ramsey did something awesome for PHP's 20th, he tweeted out the PHP timeline. I've gathered them all here to celebrate both PHP and the work he put into this project.
The post shares a long list of the tweets from the account mentioning the happenings of the last twenty years. It starts with the first release of the language back in 1995 (by Rasmus Lerdorf) and goes all the way up through the present day. It's been quite a ride over the last 20 years. If you're new to the PHP community or just want to relive some of the memories of the past, check out the full post!