Autoloading in PHP

Autoloader is a strategy for finding PHP class or interface and loading it at run time when a class is instantiated. Better than writing multiple require and include as they do not scale well and is a clutter.

Make 2 files ⇒ Greet.php(This is the class file we want to load) and mainFile.php(It will consume/use Greet.php)
Note: Keep file name and class name same.

Greet.php

<?php
class Greet{
    public function sayHello(){
        echo "Hello World From autoload";
    }
}
?>

mainFile.php

<?php
spl_autoload_register(function($class){
    require_once "{$class}.php";
});

$ob = new Greet();
$ob->sayHello();//Output : Hello World From autoload
?>