Description:
------------
Currently the internal PHP function library is, well, unique.  Proposed is a 
means to maintain backward compatibility while rectifying the problem and 
hopefully on the engine side speed up the process by reducing what the zend 
engine has to track.

import keyword.
import attaches the specified namespace to the current one. An error is thrown 
if there is a symbol collision between the namespaces.

namespace Bar {
   function Foo(){}
}
namespace Test {
  import \Bar
  Foo() // works
  Bar\Foo() // doesn't work - try use Bar instead.
}

If import is asked to pull a namespace that doesn't exist there's an error. 
Import has one other use.

namespace Test;
import @PDO;

This pulls the PDO library of PHP 6 into the Test namespace. This brings us back 
to the solution of the function library problem.

PHP 6 would ship with a legacy mode set to true. In that mode everything is as 
now - the namespace \ having thousands of functions.

Turn it off though and namespace \ is empty except for a core selection of 
functions and objects. The rest of the function library will be divided into 
libraries that can be imported as needed.

Legacy functions remain available in library legacy so

namespace MyNamespace;
import @Legacy;

would let code in MyNamespace use the current function library.