${P5SITE}/PHP/
${P5SITE}/PHP/Session/
${P5SITE}/PHP/Session.pm
${P5SITE}/PHP/Session/Serializer/
${P5SITE}/PHP/Session/Serializer/PHP.pm
@man man/man3p/PHP::Session.3p
@man man/man3p/PHP::Session::Serializer::PHP.3p