Let’s start by defining the word “function.” A function is a self-contained piece of code which carries out a particular task (or function!). A key benefit of using functions is that they are reusable; if you have a task that needs to be performed a number of times, a function is an ideal solution. They can be either defined by you or by PHP (PHP has a rich collection of built-in functions). This article will focus on programmer-defined functions but will touch briefly on PHP’s functions to complete the picture
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PHPMaster: Defining and Using Functions in PHP
Iain Tench has worked in the IT industry for 30 years as a programmer, project manager (Prince2 Practitioner), consultant, and teacher. As a project manager, he specialized in integration projects mainly involving payment systems in the financial sector. He now teaches and has acquired a Masters degree in Internet Systems Development as well as a teaching qualification. Iain's specialized areas of teaching is web technologies, mainly programming in a variety of languages, HTML, CSS and database integration. He's also written a book about Dreamweaver CS3 for Hodder Education.