PHP as programming language and server side scripting was originally using procedural programming, it’s not an object oriented language. In procedural programming, real power of PHP comes from functions ( in the PHP there are more than 700 built functions ). See detail the built in functions in the PHP, please visit PHP Site Reference.

A function in the PHP is a block of code that can be defined once and reused in multiple part of the program. Functions often take multiple parameters that allow we to pass data in and out of our functions. In some cases, a function doesn’t have to take any parameters at all. … continue reading : Basic Learning PHP Function.