Parse an ‘order’ query variable and cast it to ASC or DESC as necessary.

Converts the given orderby alias (if allowed) to a properly-prefixed value.

Parse a query string and set query type booleans.

Reparse the query vars.

Generates SQL for the WHERE clause based on passed search terms.

Generates SQL for the ORDER BY condition based on passed search terms.

Check if the terms are suitable for searching.

Parses various taxonomy related query vars.

Sets up the WordPress query by parsing query string.

After looping through a nested query, this function restores the $post global to the current post in this query.