I enjoyed Mohamed's post on using PHP and Go to have the best of both worlds.
By employing a polyglot architecture, we get the best of both worlds. PHP provides the development speed required to compete in a hyper-growth market, while Go provides more efficient resource utilization.
Another good quote from the introduction of his PHP to Go course:
PHP may be slow and memory hungry when compared to a compiled language, but that's not a result of a bad design.
It's like this by design because of all the choices it makes on your behalf to conceal complexity.
I also recommend his post on Twitter about the business decisions behind cutting costs on infrastructure.