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PHP > What are Functions in PHP?

Functions are essential building blocks in PHP programming, allowing you to encapsulate logic, promote code reuse, and improve code organization. By understanding how to define, call, and work with functions, you'll be able to write more modular and maintainable PHP code.

Functions in PHP are blocks of reusable code that perform a specific task. They allow you to break down your code into smaller, manageable parts, making it easier to read, understand, and maintain.

Creating a Function

To create a function in PHP, you use the `function` keyword followed by the function name and parentheses containing any parameters the function accepts. Here's a basic example:

function greet() {
"Hello, World!";

Calling a Function

To use a function, you simply call it by its name followed by parentheses. For example:

greet(); // Output: Hello, World!

Function Parameters

You can define parameters inside the parentheses when declaring a function. Parameters are variables that hold values passed to the function when it's called.

function greet($name) {
"Hello, $name!";

greet("John"); // Output: Hello, John!

Return Values

Functions can return values using the `return` statement. This allows functions to compute a result and pass it back to the code that called them.

function add($a$b) {
$a $b;

$result add(35); // $result will be 8

Default Parameter Values

You can assign default values to parameters, which are used when the caller doesn't provide a value.

function greet($name "World") {
"Hello, $name!";

greet(); // Output: Hello, World!
greet("Alice"); // Output: Hello, Alice!

Variable Scope

Variables defined inside a function are scoped to that function and cannot be accessed outside of it, unless explicitly declared as `global` or `use`.

Anonymous Functions (Closures)

Anonymous functions, also known as closures, are functions without a name. They are defined using the `function` keyword followed by parentheses.

$greet = function($name) {
"Hello, $name!";

$greet("Bob"); // Output: Hello, Bob!

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