PHP is a programming language. It’s like JavaScript in that you spend most of your
time dealing with values and making decisions about which path through your code
should be followed at any given time. But it’s like HTML in that you deal with output—
tags that your users view through the lens of their web browsers. In fact, PHP
in the context of web programming is a bit of a mutt; it does lots of things pretty
well, rather than just doing one single thing. (And if you’ve ever wondered why it’s
called PHP, see the box below.)

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