Chapter 4. Functions
In this lesson you will learn how frequently used sections of code can be turned into reusable functions.
Using Functions
A function is used to make a task that might consist of many lines of code into a routine that can be called using a single instruction.
PHP contains many functions that perform a wide range of useful tasks. Some are built in to the PHP language; others are more specialized and are available only if certain extensions are activated when PHP is installed.
The online PHP manual (www.php.net) is an invaluable reference. As well as documentation for every function in the language, the manual pages are also annotated with user-submitted tips and examples, and you can even submit your own comments if you want.
Note ...
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