I completely agree with this but I avoided mentioning it as I wanted to get some objective technical answers, decoupled from any of the usual operational concerns: number of people, mindset of people, seniority, etc.
I think the main cause is the low barrier for entry. It's great that anyone can get started quickly and be successful but it also means that the resulting mess can be at a level that you rarely see in other stacks where the barrier for entry is a bit higher.
I can clearly see that the PHP ecosystem is there (mature libraries for mocks, tests, etc) but like you said, there are people that just don't care. The language and ecosystem evolved faster than a big chunk of the developer community and I don't think everybody will catch-up anytime soon, as old PHP code bases can still generate a nice revenue doing maintenance.
I think the main cause is the low barrier for entry. It's great that anyone can get started quickly and be successful but it also means that the resulting mess can be at a level that you rarely see in other stacks where the barrier for entry is a bit higher.
I can clearly see that the PHP ecosystem is there (mature libraries for mocks, tests, etc) but like you said, there are people that just don't care. The language and ecosystem evolved faster than a big chunk of the developer community and I don't think everybody will catch-up anytime soon, as old PHP code bases can still generate a nice revenue doing maintenance.