Article Summary
A PHP function is a reusable block of code that performs a specific task when called. This article covers user-defined and built-in functions, syntax, arguments, return values, scope, and recursion. You'll gain a clear, practical foundation for writing cleaner, more efficient PHP code.
PHP is one of the most commonly used underlying languages of the web. A server-side scripting language, PHP has been around since the early days of the internet and continues to be useful in both static and dynamic web pages and web apps. One of the main building blocks of PHP is a function. Let’s explore what a PHP function is and how it works.
What is a function?
A function, in any language, is a discrete block of code that performs a specific task.
It may:
- Have one or more input variables or values
- Have an output (returned) value
- Change the state of one or more variables
What is a PHP function?
The user-defined function
First, you write — or declare, or define — the function. Then, you call — or invoke, or run — the function. You can write the entire function and then call it in the file, or you can call the function in the file and then write it out later. In PHP defining functions ordering doesn’t matter.
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Frequently Asked Questions
Understand what is a PHP function with an introduction to its syntax, different types of functions, and some commonly asked questions. This guide provides structured insights, proven methodologies, and actionable execution steps for modern professionals.
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