Introduction to Wordpress Filters
What is a Filter?
Filters are functions that WordPress passes data through, at certain points in execution, just before taking some action with the data (such as adding it to the database or sending it to the browser screen).
Filters passed data between database and browser. Most inputs and outputs in wordpress need to pass through at least one filter.
You can add your own filter to a plugin or theme for special purpose.
The basic steps to add your own filters to WordPress (described in more detail below) are:

Create …