WP_Term_Query::format_terms( WP_Term[] $term_objects, string $_fields ): WP_Term[]|int[]|string[]

Source

protected function format_terms( $term_objects, $_fields ) {
	$_terms = array();
	if ( 'id=>parent' === $_fields ) {
		foreach ( $term_objects as $term ) {
			$_terms[ $term->term_id ] = $term->parent;
		}
	} elseif ( 'ids' === $_fields ) {
		foreach ( $term_objects as $term ) {
			$_terms[] = (int) $term->term_id;
		}
	} elseif ( 'tt_ids' === $_fields ) {
		foreach ( $term_objects as $term ) {
			$_terms[] = (int) $term->term_taxonomy_id;
		}
	} elseif ( 'names' === $_fields ) {
		foreach ( $term_objects as $term ) {
			$_terms[] = $term->name;
		}
	} elseif ( 'slugs' === $_fields ) {
		foreach ( $term_objects as $term ) {
			$_terms[] = $term->slug;
		}
	} elseif ( 'id=>name' === $_fields ) {
		foreach ( $term_objects as $term ) {
			$_terms[ $term->term_id ] = $term->name;
		}
	} elseif ( 'id=>slug' === $_fields ) {
		foreach ( $term_objects as $term ) {
			$_terms[ $term->term_id ] = $term->slug;
		}
	} elseif ( 'all' === $_fields || 'all_with_object_id' === $_fields ) {
		$_terms = $term_objects;
	}

	return $_terms;
}

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