Namespaces and dynamic language features

Namespaces and dynamic language features

(PHP 5 >= 5.3.0, PHP 7)

PHP's implementation of namespaces is influenced by its dynamic nature as a programming language. Thus, to convert code like the following example into namespaced code:

Example #1 Dynamically accessing elements

example1.php:

<?php
class classname
{
    function __construct()
    {
        echo __METHOD__,"\n";
    }
}
function funcname()
{
    echo __FUNCTION__,"\n";
}
const constname = "global";

$a = 'classname';
$obj = new $a; // prints classname::__construct
$b = 'funcname';
$b(); // prints funcname
echo constant('constname'), "\n"; // prints global
?>
One must use the fully qualified name (class name with namespace prefix). Note that because there