History has shown
us that breaking code (e.g. PHP4 - PHP5) slows adoption of new
versions.
Bad example as PHP4 > 5 broke existing code. No existing code has namespaces in it. Anyway:
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A yet another compromise is possible as the lesser evil:
Resolution for classes:
namespace Foo;
new Bar();
1) Try to find class Foo\Bar.
2) Try to autoload class Foo\Bar.
3) Try to fallback to global *internal or user* class Bar + E_NOTICE;
namespace Foo;
$result = bar();
1) Try to find function Foo\bar().
2) Try to fallback to global *internal or user* function bar().
They key change is: not to make difference between internal and user global functions, just fall back to global ones, so that there's no additional confusion among drop-in replacements, user resources, and internal resources.
Send feedback. Thanks.
Stan Vassilev