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PHP 101 (part 6): Function-ally Yours
Find out how to create your own reusable PHP functions.

| A Little Knowledge |

If you've been taking your regular dose of PHP 101, you know now enough about PHP to write simple programs of your own. However, these programs will be "procedural" or linear - the statements in them will be executed sequentially, one after another - simply because that's the only programming style I've used so far.

You know what they say about a little knowledge being a dangerous thing... as your PHP scripts become more and more complex, it's only a matter of time before you bump your head against the constraints of the procedural method, and begin looking for a more efficient way of structuring your PHP programs.

That's where this segment of PHP 101 comes in. In this tutorial I'm going to introduce you to a new way of doing things, where code doesn't run in a straight line, but twists, leaps and bounds across the landscape of your script. Most of this activity is accomplished through a programming construct called a "function", and this tutorial teaches you how to build them (once), use them (many times), pass them arguments and have them return values, and generally make your scripts more compact, efficient and maintainable.

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