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Here's my first question at SO.
I have a internal application for my company which I've been recently ask to maintain. The applications is built in PHP and its fairly well coded (OO, DB Abstraction, Smarty) nothing WTF-ish.
The problem is the applications is very slow.
How do I go about finding out what's slowing the application down? I've optimized the code to make very few DB queries, so I know that it is the PHP code which is taking a while to execute. I need to get some tools which can help me with this and need to devise a strategy for checking my code.
I can do the checking/strategy work myself, but I need more PHP tools to figure out where my app is crapping up.
Thoughts?
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Improve Your PHP App Speed by 300% Like, you can take advantage of native functions, use JSON except for XML, use caching systems, configure OPcache, PHP-FPM, Memcached properly. You can also close the DB connection and limit the DB hits. For asset management, you can add CDNs for fast content delivery.
All PHP code is executed on a web server only, not on your local computer. For example, if you complete a form on a website and submit it, or click a link to a web page written in PHP, no actual PHP code runs on your computer.
The only way it is slower, is that the interpreter has to read more bytes. But as for execution speed, it has no influence, because they are just ignored by the interpreter. So basically, it does not matter if you add comments.
I've used XDebug profiling recently in a similiar situation. It outputs a full profile report that can be read with many common profiling apps ( Can't give you a list though, I just used the one that came with slackware ).
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As Juan mentioned, xDebug is excellent. If you're on Windows, WinCacheGrind will let you look over the reports.
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