Metadatas (any) (tag)
| add_comment_meta() | Adds metadata (custom field) for the specified comment. |
| add_metadata() | Add metadata (an additional data) for the specified object (a post, a comment, a user etc). |
| add_post_meta() | Adds meta field to the specified post. |
| add_term_meta() | Adds a meta-field (additional field) for the specified taxonomy term (categories, tags ...). |
| add_user_meta() | Adds metadata to the specified user. |
| delete_comment_meta() | Deletes additional comment data (also what custom fields for posts). |
| delete_metadata() | Deletes the metadata of the specified object (post, user, comment). |
| delete_post_meta() | Deletes all custom fields (meta-fields) with the specified key for the specified post. |
| delete_post_meta_by_key() | Deletes all meta-fields (custom fields) of all posts by the specified meta-field key. |
| delete_term_meta() | Deletes the specified meta-field of the specified taxonomy term. |
| delete_user_meta() | Deletes the specified meta-data of a certain user. |
| get_comment_meta() | Gets the metadata of the specified comment. |
| get_metadata() | Gets the metadata of the specified object (post, comment, user). Caches the result. |
| get_post_custom() | Gets a multidimensional array with data from all custom fields of the current post. |
| get_post_custom_keys() | Gets an array of keys of custom fields belonging to the current post. |
| get_post_custom_values() | Gets an array of values of custom fields with the specified name for the specified post. |
| get_post_meta() | Gets the value of the specified custom field of the post. Also can get an array of all post meta fields. |
| get_site_meta() | Gets the value of the site's meta-field in a multisite network. Also allows retrieving all meta-fields. |
| get_term_meta() | Gets the value of the specified meta-field of a taxonomy term (categories, tags, etc.). You can get all values as an array. |
| get_the_author_meta() | Retrieves the requested data of the current or requested user (post author). |
| get_user_meta() | Gets an single meta field or all meta fields of the specified user. |
| has_term_meta() | Gets all metadata of the specified taxonomy element (term). |
| is_protected_meta() | Determines whether a meta key is protected (internal). |
| register_meta() | Registers a meta key (key of custom field). |
| register_post_meta() | Registers a meta key for posts (post custom field). |
| register_term_meta() | Registers a meta-field for the specified taxonomy. |
| sanitize_meta() | Clears the value of meta data. The function itself does nothing, but applies the filter |
| the_author_meta() | Outputs the specified meta-field of the current or specified user. The meta-data is specified in the profile. |
| the_meta() | Outputs custom fields of a post (metadata from wp_postmeta). The fields are displayed in a list <li>. Hidden fields are ignored. |
| update_comment_meta() | Updates or adds metadata for the specified comment. |
| update_metadata() | Update metadata for the specified object. If no value already exists, the metadata will be added as new metadata. |
| update_post_meta() | Updates specified meta field of specified post. Or adds it, if it's not exists. |
| update_term_meta() | Updates the metadata of a taxonomy term (categories, tags ...). |
| update_user_meta() | Updates the meta-field of the specified user. |
| wp_read_image_metadata() | Gathers an array of useful image metadata from the exif and iptc file metadata. |