Namespaces in PHP (WordPress)

Since the version 5.3 we have namespaces in PHP.
Here is how you would define one.

//Pizza.php
namespace Food;
class Pizza{
    public function eat(){
      return 'yummy!';
    }
}

You would call that like this:

//main.php
require 'Pizza.php';
$pizza = new \Food\Pizza();
echo $pizza->eat();

Or like this.

//main.php
require 'Pizza.php';
use Food\Pizza;
$pizza = new Pizza();
echo $pizza->eat();

Note that when you write use statement you can use both the notations.

use \Food\Pizza;
use Food\Pizza;

But the later one is my favorite.
This is not the case when you write the new statement

namespace Kings;
$pizza = new Super\Big\Pizza();
// "Class not found Kings\Super\Big\Pizza"

$pizza = new \Super\Big\Pizza();
// This works!

So it is always good to use \ after the new keyword.

Next, go ahead and shorten the long namespaces like this

use Kings\Big\Pizza as KBPizza;
$pizza = new KBPizza();

This will save you some keystrokes.