[pestaa]

If your namespaces are all lowercase after adopting PSR standards, you haven't really adopted the PSR standards.

[cebe]

PSR-4 does not require any case for namespaces:

> Alphabetic characters in the fully qualified class name MAY be any combination of lower case and upper case. http://www.php-fig.org/psr/psr-4/

[phpnode]

none of the PSRs specify that the namespace name should be capitalized.

[samdark]

Why?