I showed an earlier version of this here a bit over two years ago. Since then, Reli has grown a lot.

Reli is a sampling profiler and VM state inspector for PHP, written in PHP, that inspects running PHP processes from the outside.

In 0.12.0, tracing, memory analysis, monitoring, and runtime inspection all expanded quite a bit.

I would be especially interested in feedback on whether the memory-analysis, watch, and variable-inspection direction looks useful.