If you don't know, then I can't tell you :P Seriously, the biggest problem with php is that fundamentally it's a templating language. One thing I've seen with

If you don't know, then I can't tell you :P Seriously, the biggest problem with php is that fundamentally it's a templating language. One thing I've seen with templating libraries in general, is that they are meant to take a template and a data structure and display output based on these 2, but what ends up happening is they end up converging on turing completeness. It starts with the need for some kind of looping structure in the template. And then someone needs some random logic that is easier to do in the template than before the model, and so another feature gets added to the templating engine. And so it goes, things get kind of bolted on, without a grand vision, and you end up with an API that is inconsistent, where the order of inputs is never the same (is the first parameter haystack or needle??). Also, the basic shape of the code that tends to get written in PHP is heavily influenced by it's being a templating language. PHP applications tend to end up having a lot of code in the template, that should be done before rendering the model. Rather than a sane 2 pass system, where all the data is gathered and the logic handled to produce a simple data structure that is passed to a very simple template, you end up with crazy monstrosities where there's opening and closing <?php> tags everywhere. And you render part of the page, then grab some more data, then render some more page, then maybe do a curl to a 3rd party vendor, then render some more of the page, and it's actually very hard to keep switching mental state to match the context of the code you're looking at. Anyhoooo, you're getting downvoted because there's lots of literature on why PHP is a terrible language. I'm only replying because it's sort of cathartic, since I maintain a wordpress codebase, and any time I have to interact with core, instead of being able to sanely intercept the underlying data, modify it then pass it along in one place, I have to constantly add lots of random hooks in lots of random places to catch the data just before it's being rendered. It's a total mess, and far more complicated than it needs to be (though there is some debate whether this style made it more approachable from a novice plugin development perspective).