Yes it's perfectly fine to use PHP if it's a productive environment for you. Of course it's possible to write good software with it. Of course a skilled developer will manage to do great things with sub-standard tools. Many extremely popular websites were and even still are powered by PHP, that's undeniable.
But that doesn't mean that we should absolve PHP of all its many, many design errors over the years. There were for a long time many fundamental issues with PHP as a language that didn't exist with its peers. The language was not so much designed as it was cobbled together by amateurs starting from a half-backed templating engine.
I'm not saying that to hate on PHP, I just believe that it's important to learn from your mistakes if you don't want to end up reproducing them. It's important to acknowledge the many failings of PHP even if many of them are now ancient history.
This revisionist stance that there was never anything really wrong with PHP and it's just Lispers who hated on the language because it was popular and beginner-friendly and they didn't know what they were talking about is simply, factually, provably untrue.