![]() ![]() It’s very similar to what we’re using in P3. Xdebug is a free and open source project by Derick Rethans and is probably one of the most useful PHP extensions. The SimpleProfiler class below should get you started on your own custom PHP profiling solution. We manually added debug statements in our code until Xdebug filled the void. There are also slight variations in the arguments for debug_backtrace() between PHP versions. There are many types of callable functions in PHP that are detected using debug_backtrace(), such as includes, object calls, static method calls, function calls, and anonymous functions. This method isn’t perfect (I’ll discuss some known issues later), but it’s perfectly usable. Go Daddy released a performance tool for WordPress (shown below), using this exact technology and it has been used successfully by thousands of customers across dozens of server configurations. You may have some questions like, “How well does this scale to large projects?” or “Does it really work across platforms?” or “How reliable are these numbers?” or “What’s the performance penalty?”Ĭheck out the P3 Plugin for WordPress. ![]() These results match the programmed pauses that were placed in the code.Īt this point, I hope your mind is swarming with possibilities. You can read more on the PHP documentation site declare(ticks=1) What Is Xdebug Install Xdebug in PHP Windows MAC Linux GIT Configure Xdebug in VSCode Xdebug Profiling Final Words Let’s start with the basic level, where you tend to write PHP code using printr (), vardump () commands to debug the output of the written code. Generally, this is one tick per statement, but there are exceptions. A tickable event is a low level parser operation. PHP has an internal function called register_tick_function() that lets you call a function whenever a tickable event occurs. Or, perhaps you’d like your profiler to automatically capture the function arguments every time DbAdapter::query() is called and log them to a file. We found it incredibly useful to have a profiler that knew the difference between a WordPress plugin, a WordPress theme, and the WordPress core based on what was happening in the code or where the function was defined. While the appropriate tools ensure effective and efficient performance optimization, a good PHP profiler monitors your production environment, and helps you. The “my-plugin” plugin is entirely contained within the wp-content/plugins/my-plugin folder. For example, in WordPress, plugins are confined to a known set of files. What’s the best way to solve that problem?Ĭonsider the use case of a custom profiler. If you were not able to load any new extensions into your environment, you would not be able to use classic profiling tools like xdebug. These profilers require you to load a PHP extension. You may have used a code profiler such as xdebug or xhprof before. So, I’d like to share my findings about how to write a code profiler, what pitfalls you will encounter, and offer you some working code to get you started. However, I discovered that it’s both possible and incredibly useful to write your own code profiler in PHP. I often find myself saying, “Yes, you can do that in PHP.” When I was challenged with writing a code profiler in PHP, I thought I would choke on those words. ![]()
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