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How can you determine the performance consequences of your PHP code if you are not familiar with the internals? Are there ways to figure out how your code is being executed (besides simply load testing it)? I am looking for things like memory usage, the execution time for algorithms.
Perhaps Joel would say, ‘learn C, then read the internals’, but I really don’t have time to learn C right now (though I’d love to, actually).
Use the Xdebug extension to profile PHP code.