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How to Add a Custom Taxonomy to Users in WordPress

Last Tested: 2/5/2022

This will guide you through setting up a custom taxonomy that you can add to and change whenever you are looking at the profile of a user, it has functions to register, display and save the changes to the taxonomy. In our example we are going to assign each user a department or departments, to later use to give them access to the page or pages for the given department.

/* Step 1 Register the Taxonomy */
Register the taxonomy by placing the function below in your functions.php file or in your plugin file depending on your preference:

Step 2: Add the Admin page for the custom Taxonomy by adding the code below to your functions.php file or to a plugin file. We will add this page as a sub-item of the Users menu on the WordPress dashboard. This page will allow us to define the different more specific departments that will be options in our custom taxonomy like ‘Sales’ and ‘IT’. Don’t forget to actually add those departments to the taxonomy or no choices will be rendered:

/* Step 3 */

As the next step we are going to add the code below to… you guessed it, the functions.php file or a plugin file. The code below is going to add the taxonomy we defined in the previous steps to the profile of every user so that we can set each user’s department.

/* Step 4 */
Define the function for saving the custom taxonomy by putting this code into… well the functions.php file or a plugin file. You probably get that by now but the code below does define that function:

That was it! Four steps to add this awesome functionality. This data stored per user is very useful for having different types or tiers of users that have access to special content that is hidden from everyone else. Happy WordPressing!

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