PHP code comes in the form of scripts, which are plain-text files that you create and fill with code. Whereas HTML uses lots of angle brackets and keywords like html, head, and ul, PHP uses lots of dollar signs ($) and keywords like mysql_query and echo. So, HTML and PHP don’t look at all alike. But where they are alike is in the basic underlying format: they’re both just text. You can open up an HTML document not just in a web browser, but in Notepad or an integrated development environment (IDE) like Eclipse or even a command-line editor like vi or emacs. The same is true for PHP: it’s just text. So, get ready; throughout this book, you’ll be typing words—albeit strange ones, with lots of underscores—and saving those words into
text files called scripts.

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