Short-circuits adding metadata of a specific type.

Description

The dynamic portion of the hook name, $meta_type, refers to the meta object type (post, comment, term, user, or any other type with an associated meta table).
Returning a non-null value will effectively short-circuit the function.

Possible hook names include:

• add_post_metadata
• add_comment_metadata
• add_term_metadata
• add_user_metadata

Parameters

$checknull|bool

Whether to allow adding metadata for the given type.

$object_idint

ID of the object metadata is for.

$meta_keystring

Metadata key.

$meta_valuemixed

Metadata value. Must be serializable if non-scalar.

$uniquebool

Whether the specified meta key should be unique for the object.

Source

$check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique );

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