That's an interesting question.

My impression (based on nothing more than anecdotal industry experience) is that there are far more jobs for PHP globally, and that the average starting salary for a new PHP dev is going to be considerably lower than the average starting salary for a new Go dev.

However, the number of stable senior PHP dev jobs with high salaries is also likely far higher than for Go.

I imagine it's easier to earn more as a new Go developer if you can get a job doing it, but it's easier to steadily get raises as a PHP developer.

I don't speak for the parent (and I don't think the assertion is correct), but I will say that PHP jobs outside the valley are plentiful. A large percentage of those are legacy maintenance or development on unpleasant platforms such as WordPress or Magento, but there is still a lot of challenging and enjoyable work being done using PHP, and the improvements to the language over the last few years have made many of the old arguments against the language obsolete.

Individually no. In aggregate salaries, yes.