How does PHP work - literature
<p>I'm interested in literature (articles on internet, in magazines, books, podcasts - I don't really mind anything) that describes how PHP works internally, about its gotchas and perhaps some advanced functions. Is there anything like this out there? I tried to search on Google, but majority of articles were about starting with PHP and its basic functions.</p>

<p>Any input is really welcome as I'm trying to understand the language internally - I'm tired of my mindless typing of code without understanding its essence.</p>
