A sampling profiler or a memory profiler for PHP written in PHP, which reads information about running PHP VM from outside the process. You can find performance bottlenecks or memory leaks of your scripts without changing the target script or loading extensions.

PHP Profiler & Developer Toolbar (built for Phalcon)

A free, flexible, powerful tool that helps you monitor PHP Service and profiling PHP code.

PHP profiler module with recursion handling

Simple Profiler for PHP projects.

Profiling The Php Code

A lightweight, extensible PHP debugging tool with error handling, performance profiling, and a powerful UI debug bar. Works for both web and CLI applications.

A simple PHP library for tracking the total amount of time a callable (e.g. function / method) takes to execute and return result(s) (if any).

Simple PHP Profiler