Profiling PHP - PHPAmersfoort Meetup 2015-03-10
Profiling PHP - AmsterdamPHP Meetup - 2014-11-20
Profiling PHP - PHPBenelux Unconference track - 2015-01-24
Profiling PHP - WordPress Meetup Nijmegen 2015-03-11
Measuring maintainability; software metrics explained