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Profiling PHP with XHProf & XHGui
Dec 18th, 2015 by pixel

For a well described tutorial on basic PHP profiling and optimization I would recommend the 3 part article written by Davey Shafik:

Profiling PHP Part 1: Intro to Xhprof & Xhgui

Profiling PHP Part 2: Xhgui In-Depth

Profiling PHP Part 3: Practical Performance Tuning