WordPress 5 Cookbook

How it works...

The built-in custom field feature and the fields we created in the Creating and managing advanced post fields recipe stores the data in the wp_postmeta table. So, the process of retrieving and displaying the custom field data is straightforward with the use of the get_post_meta function. This function takes two parameters called post ID, meta key, and Boolean value to decide the return value. Let's take a look at these parameters:

• post_id: This is the ID of the post where we want to retrieve the custom field value. This is a mandatory parameter.
• key: This the meta key value we want to retrieve from the database. This is an optional parameter. If this parameter is omitted, all the custom meta values for the post will be returned. ...