Explains the way we can use **namespace** in PHP.  ![](https://cdn.cacher.io/attachments/u/36phgkf4zb6em/-7bk2WINhh070Mx0msvLzLawtXaHsxDc/tigwjzixc

first-class.php

<?php

class A {
	public function __construct() {
		echo "Hello from first class file.";
	}
}

index.php

<?php

// namespace second;
use second\A as AC;

require_once(  'first-class.php' );
require_once( 'second-class.php' );

$object = new AC; // Renamed class from A class under 'second' namespace.
$object = new \A; // To use as global (first file class).

second-class.php

<?php

namespace second;

class A {
	public function __construct() {
		echo "Hello from second class file.";
	}
}