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I would like to read constant values (settings) from one place, and thought of using qa-plugin.php

Can I declare global variables in qa-plugin.php? What to be aware of?
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That is a good point. I found myself repeating 'constants' across multiple files in a plugin.
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I still haven't found out how declare a global variable in a qa-plugin.php and read it e.g. from a widget module or layer...

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Yes, you can by all means - just make sure you stick to a namespace which won't clash with other things, e.g. use your plugin name as a variable prefix.
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thanks for your reply :)
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