Talk by Rasmus Lerdorf at Etsy HQ. Covers engine improvements, breaking changes, a little about their process and internals too. The talk has a good pace and kept me interested.<p>Thanks to Etsy Engineering for hosting & posting!<p>Official "Migrating from PHP 5.6.x to PHP 7.0.x" page: <a href="http://www.php.net/migration70" rel="nofollow">http://www.php.net/migration70</a>