Update an Existing Custom Field

Let’s update an existing custom field, which is a post metadata, in the database. You’ll use update_post_meta() and walk through using it. You’ll see what it does in the database, how to use it, what the different arguments do, and even peak into WordPress Core.

This function does multiple tasks:

• If the post metadata exists, it updates the meta_value WHEN
  • 'unique' is set to false.
  • OR 'unique' is set to true and the existing meta_value matches what you pass in as the previous argument.
• If the post metadata doesn’t exist, then it adds it into the database.

So this function can update as well as add a new one. Cool. Come do this episode with me to dive into it and understand how to use it.