By Brian Messenlehner
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Additional info for Building Web Apps with WordPress: WordPress as an Application Framework
If you want to ensure that a given meta key is only ever used once per user, you should use this function and set the $unique parameter to true: • $user_id—A required integer of a user ID. • $meta_key—A required string of the meta key name for the meta value you would like to store. • $meta_value—A required mixed value of an integer, string, array, or object. • $unique—An optional Boolean, which when set to true will make sure the meta key can only ever be added once for a given ID. info | 31 delete_user_meta($user_id, $meta_key, $meta_value = '') Deletes user metadata for a provided user ID and matching key.
Frequent Security Updates The fact that WordPress is used on millions of sites makes it a target for hackers trying to break through its security. Some of those hackers have been successful in the past; however, the developers behind WordPress are quick to address vulnerabilities and release updates to fix them. It’s like having millions of people constantly testing and fixing your software, because that’s exactly what is happening. The underlying architecture of WordPress makes applying these updates a quick and painless process that even novice web users can perform.
You can also specify a matching meta value if you only want to delete that value and not other metadata rows with the same meta key: • $post_id - A required integer of a post ID. • $meta_key - A required string of the • $meta_value - An optional mixed value of the meta value. If you have more than one record with the same meta key, you can specify which one to delete by matching this value. It defaults to nothing, which will delete all meta rows with a matching post_id and meta_key. In Example 2-5 we will get the last post and add, update, and delete various post meta.