In his latest post, Stuart Herbert has shared some thoughts about the recently proposed PSR-3 proposal for a unified logging interface for PHP projects.
PSR-3 is a proposed standard (voting has finished, it should appear as an accepted standard when the PSR folks recover from too much Christmas turkey) describing a common logging interface for PHP frameworks. It's based on a small subsection of RFC 5424, which describes the Syslog standard, which is a very sensible choice. Sysadmins think in terms of Syslog levels, and they utterly hate dealing with loggers that don't map cleanly onto Syslog.
He briefly introduces the PSR and the format of the logger with some of the main methods it should implement and what they do. He talk gets into some of his critiques about the proposal, namely the method naming, the exception handling parameter and the proposed LogLevel constants.