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How To Debug Magento Step By Step?
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The following debugging tips can be applied towards any LAMP/XAMPP application we wanted to give a more brief focused step by step debugging checklist for Magento.
Get XDebug or ZendDebugger Working
When all else fails, putting a break-point in the beginning of your back trace and stepping line by line is the best way to debug and/or learn what Magento is doing.
Articles about setting up XDebug with PDT
Articles about setting up ZendDebugger with PDT
Clear the Cache
If you are using caching at all within Magento, one of the first steps to answering the question – “Why is this not working?” – is to clear the Magento cache. There are two ways to clear the cache:
System > Cache Management > Select All > “Refresh” Massaction > Submit
Delete the “cache” directory under BASE_MAGENTO_DIR/var
Clear the Browser Cache
More than once, I have wasted 10 minutes trying to figure out why something wasn’t rendering to the browser correctly, only to find that my browser was caching old responses. If you don’t know how to clear your browser cache, see the following links:
Make Sure Your Configurations Are Set For the Proper Scope
Because the System > Configurations can be set for specific scopes (Default / Website / Store View), we have to make sure that we have set the configurations for the proper scope. To check this, use the Magento Admin Panel -
System > Configuration > Upper Left Corner (Change to the scope/store view you are working with)
Turn On Logging
This one is a big one. Almost EVERY time, if there is a problem in Magento, something will appear in either the system.log or the exception.log. Checking these logs should become second nature to you. To turn on logging, use the Magento Admin Panel -
System > Configuration > Advanced > Developer > Log Settings > Enable
Check the magento exception.log under BASE_MAGENTO_DIR/var
Check the magento system.log under BASE_MAGENTO_DIR/var
Use Template Path Hints
Template Hints are pretty amazing. When you want to figure out which Block or phtml file a problem is occurring in, you can turn on template hints and see the information right on the browser. It’s awesome, so if you haven’t tried it, try it right now.
To turn on template path hints, use the Magento Admin Panel -
First, you NEED to select the store view you want to show the hints on. If you don’t, the configuration option won’t appear.
System > Configuration > Advanced > Developer > Debug > Template Path Hints and/or Add Block Names to Hints
By default, there is no way to turn on hints for the Admin Panel, so take a look at this article for help: Enable Template/Block Hints in Admin Panel
If you have implemented a home-grown tracing mechanism, turn it on and look at the log. A common tracing mechanism consists of coding tracing statements within the code that log ENTRY into a function, important information within the function, and EXIT from the function. This information can be crucial in debugging problems in a production environment.
XDebug provides some pretty kick-butt tracing ability. If you turn it on, get ready for a lot of data, but it can be very helpful when trying to pinpoint a problem.
Check the Apache error_log
When all else fails, take a look at the apache error_log. It could be a problem with the setup of your webserver.
It may come as a surprise, but there are still people that don’t turn to Google as a “troubleshooting option”. They should. When you want to ask a developer something, first ask it to Google. For instance, if you want to know how to do a rewrite of a model, just Google: How do I rewrite a model in Magento. If you want to know why you are getting an error like “HEADERS ALREADY SENT”, Google: headers already sent magento. Chances are, another developer will give you a response like THIS if you ask them the question anyway.
Search Or Ask The Magento Forums
One of the big pros to Magento is the active community members. Many are willing to help answer your questions for free, and quickly. Before you ask your question, search the forums. If you don’t find your answer, ask your question.
Use the Varien_Profiler
If you are having performance issues, turn on and use the Varien_Profiler. Do this in the Admin Panel -
System > Configuration > Advanced > Developer > Debug > Profiler
Then, if you still can’t figure it out, start all over again.
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