Description:
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Your documentation page at http://www.php.net/manual/en/language.namespaces.nested.php gives the following example use of the "namespace" keyword for declaring sub-namespaces:

namespace MyProjectSubLevel;

Below the example, it explains, "The above example creates constant MyProject\Sub\Level\CONNECT_OK, class MyProject\Sub\Level\Connection and function MyProject\Sub\Level\Connection."

Yet the name of the namespace given in the example contains no delimiters.  I don't see how the PHP interpreter can know that "MyProject" is the first level namespace, "Sub" is the second level namespace, and "Level" is the third level namespace.  So I'm guessing that the line in the example is missing some delimiter.  Given that many Unix tools use the character "\" to quote the following character, it seems possible that whoever wrote the documentation inserted a single backslash where what was needed was to have the backslash itself quoted by being preceded by another backslash.

Please check and fix the documentation, and make it clear exactly which character PHP recognizes as the delimiter between multiple levels of a namespace hierarchy.