Stick with log4j and allow Logger::getLogger(...)

Hello

Both log4j and JDK Logger are suggest using Logger::getLogger() as you can see in:

http://java.sun.com/j2se/1.4.2/docs/guide/util/logging/overview.html
http://logging.apache.org/log4j/1.2/manual.html

I admit that I don't yet understand why there is a LoggerManager class and how it relates to the Logger class but we should try to copy & paste as much as possible from the existing
log4j (and log4perl etc) projects. It's log4xxx nevertheless and what would be the benefit from a cross-language standard if we start diversing from it at the very first command

A patch will be attached (I didn't try out if the phpdoc looks good)

bye,

christian