Functions

Function

In PHP, a function is a block of code that can be called by name. Functions allow you to reuse code and modularize your scripts by breaking them up into smaller, self-contained units of functionality.

Here is an example of a simple function in PHP:

function sayHello($name) {
 echo "Hello, $name!";
}

To call a function, you simply use its name followed by parentheses and any necessary arguments:

sayHello("John");  // prints "Hello, John!"

Functions can also accept multiple arguments and return a value:

function add($x, $y) {
 return $x + $y;
}
echo add(2, 3);  // prints 5

Functions can also be defined inside classes, in which case they are called methods. Here is an example of a method in a class:

class Person {
 public $name;
 
 public function sayHello() {
   echo "Hello, my name is $this->name.";
 }
}

Functions are a powerful and important feature of PHP, as they allow you to reuse code and modularize your scripts. They also help to make your code more organized and easier to maintain.