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How to create a custom wordpress plugin for a specific functionality?

I have used this same code and it does work. However, you need to use an action hook instead of a filter, as follows:

Replace add_filter('loginout', 'techyparas_log'); with:

add_action('init', 'techyparas_log');

Also, I set this up as a must-use plugin, but I don’t see why it wouldn’t work as a regular plugin.

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