There's no reason to talk about PHP in the past tense, it's still around and actively being maintained. Of course, it has fallen out of favor and been replaced mostly with Node et al (which is IMHO a change for the worse, but opinions may differ).

PHP's "batteries included" approach is probably a product of it being launched before package managers became ubiquitous (the PHP package manager Composer was only released in 2012), Go's is a conscious decision.