Appends a trailing slash.

Updates post meta data by meta ID.

Shortens a URL, to be used as link text.

Validates a file name and path against an allowed set of rules.

Sends a pingback.

This was once used to create a thumbnail from an Image given a maximum side size.

Legacy function used for generating a categories drop-down control.

Display archive links based on type and format.

Fire the wp_head action.

Converts to ASCII from email subjects.