Tricks for namespace

BarXyz.php

<?php
namespace bar;
class Xyz
{
}
function abc()
{
    return __NAMESPACE__;

FooXyz.php

<?php

namespace foo;

class Xyz
{
}

function abc()
{
    return __NAMESPACE__;
}

namespace-keyword.php

<?php

namespace bar;

require 'foo/Xyz.php';
require 'bar/Xyz.php';

use foo\Xyz;
use foo\abc;

$x = new Xyz(); // instantiates \foo\Xyz.

$y = new namespace\Xyz(); // the namespace is equivalent to the self operator for classes.

$z = abc(); // invokes \bar\abc regardless of the second use statement.

$u = \foo\abc();

var_dump($x, $y, $z, $u);