registered_meta_key_exists()
Function: Checks if a meta key is registered.
Source: wp-includes/meta.php:1590
unregister_meta_key()
Function: Unregisters a meta key from the list of registered keys.
Source: wp-includes/meta.php:1608
get_registered_meta_keys()
Function: Retrieves a list of registered metadata args for an object type, keyed by their meta keys.
Source: wp-includes/meta.php:1657
get_registered_metadata()
Function: Retrieves registered metadata for a specified object.
Source: wp-includes/meta.php:1683
delete_{$meta_type}_metadata
Filter Hook: Short-circuits deleting metadata of a specific type.
Source: wp-includes/meta.php:428
delete_{$meta_type}_meta
Action Hook: Fires immediately before deleting metadata of a specific type.
Source: wp-includes/meta.php:479
delete_postmeta
Action Hook: Fires immediately before deleting metadata for a post.
Source: wp-includes/meta.php:490
deleted_{$meta_type}_meta
Action Hook: Fires immediately after deleting metadata of a specific type.
Source: wp-includes/meta.php:528
deleted_postmeta
Action Hook: Fires immediately after deleting metadata for a post.
Source: wp-includes/meta.php:539
get_metadata()
Function: Retrieves the value of a metadata field for the specified object type and ID.
Source: wp-includes/meta.php:573