[AaronNewcomer]

On a quick search of PHP skills wanted on LinkedIn jobs I found the following large companies looking for it: Apple, Cloudflare, Vimeo, Box, Slack, Tesla, Etsy, Wayfair, Shopify, Facebook, Etc

[sroussey]

Clearly WordPress and Magento based businesses. Add in Facebook, Weebly/Square, and you realize that PHP probably drives more page views and powers more domain named sites than any other.

[spdionis]

How are Vimeo and Slack Magento or Wordpress businesses? Etsy also most certainly does not primarily use those.