Coding the Plugin Logic

Filter content to calculate post metrics

Now we will add the logic to calculate the read time and word statistics for the post metrics plugin. We need to filter the content of a post to be able to make these calculations.

We saw an example of filtering the post content in the Introduction to Plugin Development lesson. Using the add_filter function in the constructor, we will hook on to the the_content filter and call a method calculate_post_metrics at that filter.