The function Keyword

The keyword function is used to declare user-defined functions in PHP. A function accepts parameters, executes code, and can return a result. Declared functions can be called multiple times in different parts of the program.

Syntax

function functionName($param1, $param2, ...) {
	return $result;
}

Example

Let's create a simple function to add two numbers:

<?php
	function sum($a, $b) {
		return $a + $b;
	}
	
	echo sum(2, 3);
?>

Code execution result:

5

Example

A function can return different data types. Let's create a function that returns an array:

<?php
	function createArray($a, $b) {
		return [$a, $b];
	}
	
	print_r(createArray(1, 2));
?>

Code execution result:

[1, 2]

Example

Functions can have default parameter values:

<?php
	function greet($name = 'Guest') {
		return "Hello, $name!";
	}
	
	echo greet();
	echo greet('John');
?>

Code execution result:

'Hello, Guest!'
'Hello, John!'

The function Keyword

Syntax

Example

Example

Example

See Also