PHP: WordPress get_terms_fields for taxonomy.php

get_terms_fields.php

<?php

add_filter( 'get_terms_fields', 'wps_get_terms_fields', 10, 3 );
/** .. Known filter; removed docs for brevity **/
function wps_get_terms_fields( $selects, $args, $taxonomies ) {
	if ( 'slug=>name' === $args['fields'] ) {
		return array( 't.slug', 't.name', 'tt.count', 'tt.taxonomy' );
	}

	return $selects;
}

add_filter( 'get_terms_fields_terms', 'wps_get_terms_fields_terms', 10, 4 );
/**
 * Filter the given taxonomy's terms for terms with posts (items) of publish post_status.
 *
 * @param  array  $terms      Array of terms (maybe cached) for the given taxonomy.
 * @param  string $fields    Current fields to return from args fields parameter.
 * @param  array  $taxonomies An array of taxonomies.
 * @param  array  $args       An array of get_terms() arguments.
 *
 * @return array $terms     Maybe filtered terms.
 */
function wps_get_terms_fields_terms( $terms, $fields, $taxonomies, $args ) {
  if ( 'slug=>name' === $$fields ) {
    $_terms = array();
		foreach( $terms as $term ) {
		  $_terms[ $term->slug ] = $term->name;
		}
	}
	return $terms;
}