At a very rough guess (and having looked at a lot of job adverts towards the end of last year), PHP has come one quite a bit in the past few years so there are more jobs asking for (say) a 'symfony/laravel/drupal/wordpress' developer rather than a PHP one.
Compare google trends for PHP and Laravel for instance :
https://trends.google.com/trends/explore?q=php
https://trends.google.com/trends/explore?q=laravel
That said - it's always worth having another language or two in your toolbelt. In job terms, Javascript, python and java aren't going to disappear anytime soon (and I think PHP will be around with them).