Tutorial: How to add action to excerpt in WordPress

In case some of you don't know what the title of this post means, it has to do with building plugin for WordPress. Let me explain  a little on what does an action means in WordPress. Basically, we can add a function to an action or event (whatever you called it) in WordPress to perform some task before or after the action or event has occured.

Problem

The reason why i bought this post up was because i nearly get frustrated working on my WordPress plugin because there wasn't any action listed in WordPress plugin API that stated an action that can be attached to an event before or after an excerpt is being bought out! Search all over the place, fail. So i decided to do a trial and guess with these action thing for my plugin to attached an event when an excerpt is being bought out.

Solution

In case you might not aware how a excerpt is being printed out on the template, they used

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