The Metadata API is a simple and standarized way for retrieving and manipulating metadata of various WordPress object types.
Metadata for an object is a represented by a simple key-value pair.
Objects may contain multiple metadata entries that share the same key and differ only in their value.
Function Reference Function Reference
Database Requirements Database Requirements
This function assumes that a dedicated MySQL table exists for the
$meta_type you specify. Some desired
$meta_types do not come with pre-installed WordPress tables, and so they must be created manually.
Default Meta Tables Default Meta Tables
Assuming a prefix of
wp_, WordPress’s included meta tables are:
wp_commentmeta: Metadata for specific comments.
wp_postmeta: Metadata for pages, posts, and all other post types.
wp_usermeta: Metadata for users.
Meta Table Structure Meta Table Structure
To store data for meta types not included in the above table list, a new table needs to be created. All meta tables require four columns.
meta_id– BIGINT(20): unsigned, auto_increment, not null, primary key.
object_id– BIGINT(20): unsigned, not null.
Replace object with the singular name of the content type being used.
For instance, this column might be named post_id or term_id.
Although this column is used like a foreign key, it should not be defined as one.
meta_key– VARCHAR(255): The key of your custom meta data.
meta_value– LONGTEXT: The value of your custom meta data.
Source File Source File
Metadata API is located in