I don't think it's exactly synonymous with market share. The numbers are a bit distorted due to a few "killer apps" like Wordpress. I think if you looked at it

I don't think it's exactly synonymous with market share. The numbers are a bit distorted due to a few "killer apps" like Wordpress. I think if you looked at it in terms of number of developers using a language then it will have fallen quite precipitously. Dying is an exaggeration anyway, I think PHP is just no longer in it's glory days of the 00s. I'm personally hopeful that PHP might have a renaissance. The language developers have done a really good job of modernising it and removing the really nasty stuff over the last ~7 years, I think it's just the standard library that's left as a significant eyesore. Unfortunately Nikita's stepped down from PHP development recently and he was a real powerhouse so it remains to be seen if it can maintain its trajectory.