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How to debug PHP?

 
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I'd like to know what's the best method to debug a PHP application. Usually I use "echo", but I think it is too intrusive...
 
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There seems to be a good selection of PHP debugging tools at the following web page:

http://pelfusion.com/tools/how-to-debug-php-code-and-useful-php-debugging-tools/
 
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If you have an IDE that supports remote debugging such as NetBeans, Eclipse, PhpStorm or Zend Studio, you'll be able to debug your code on a remote server that has the Xdebug extension enabled. Run code one command at a time, see the values of variables at runtime and much more.

Furthermore, if you enable Xdebug's profiler, you can use a profiling tool in your IDE (or an external one like CacheGrind) to analyze which functions are slowing your application d
 
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