Thanks for your article,
https://trends.google.com/trends/explore?q=php,python might be helpful.
I don’t think the trend that you described is true. Seems like Java or c# should have the market share at most while Ruby and Go and even Node are very popular and in use widely.
We can have a look at this chart as well: https://insights.stackoverflow.com/survey/2017#most-popular-technologies