Pings back the links found in a post.

Registers default settings available in WordPress.

Registers a post type.

Registers a new field on an existing WordPress object type.

Registers a setting and its data.

Creates or modifies a taxonomy object.

Converts all accent characters to ASCII characters.

Returns a contextual HTTP error code for authorization failure.

Retrieves the pixel sizes for avatars.

Retrieves the avatar urls in various sizes.