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How do you update post meta?
Updates a post meta field based on the given post ID. Use the $prev_value parameter to differentiate between meta fields with the same key and post ID. If the meta field for the post does not exist, it will be added and its ID returned.
How do I register Meta in WordPress?
Pass an empty string to register the meta key across all existing post types. (string) (Required) The meta key to register. (array) (Required) Data used to describe the meta key when registered. See register_meta() for a list of supported arguments.
How to use update post meta in WordPress?
The products in my clients website require certain attributes which I have added via Products -> Attributes in the WordPress administration. In this import script I’m coding I need to use the function update_post_meta ($post_id, $meta_key, $meta_value) to import the proper attributes and values.
How to differentiate between Meta fields in WordPress?
Use the $prev_value parameter to differentiate between meta fields with the same key and post ID. If the meta field for the post does not exist, it will be added and its ID returned. Can be used in place of add_post_meta (). (int) (Required) Post ID. (string) (Required) Metadata key. (mixed) (Required) Metadata value.
What to do if the meta field does not exist?
If the meta field for the post does not exist, it will be added and its ID returned. Can be used in place of add_post_meta (). (int) (Required) Post ID.
How are post meta values passed through stripslashes ( )?
Post meta values are passed through the stripslashes () function upon being stored, so you will need to be careful when passing in values (such as JSON) that might include \\ escaped characters. By adding one more level of \\ escaping using function wp_slash (introduced in WP 3.6), you can compensate for the call to stripslashes ()