Extensions have always been PHP's strong point, but some newer stuff isn't as supported as well as it is in Python or Node because of PHP's lack of good async code.
Overall it's a step in the right direction, but PHP needs more big changes.
I have PHP7 on my dev system, had to make some adjustments to get my 5.x code working again due to deprecation and syntax enforcement this included a couple lines in the TCPDF library I use. So for me the immediate impact of PHP7 will be the breaking of some legacy code. Then maybe, in a few years, the new features will be ubiquitous enough for me to implement.
[1] http://engineering.dailymotion.com/php-7-deployment-at-daily...
[2] https://engineering.tumblr.com/post/152998126990/php-7-at-tu...
[3] (from 2015) https://make.wordpress.org/core/2015/09/10/wordpress-and-php...