The WordPress Studio Framework (WPSF) can also be used to create additional fields on WordPress taxonomies.

Arguments

Name	Type	Default	Description
taxonomy	array|string		Provice any number of taxonomy slugs for a given “term” box to appear
data_type	string	serialize	Database save option type (serialize | unserialize)
defaults	array		Sets all default values from an external array (optional)
class	string		Extra CSS classes (space separated) to append to the main framework

Taxonomy Options Framework Example

// Check to see if WordPress Studio Framework is loaded
if ( class_exists( 'WPSF' )){
  //Set unique ID
  $prefix = 'custom_tax_options';

  //Create taxonomy options
  WPSF::createTaxonomyOptions( $prefix, array(
    'taxonomy' => 'category',
    'data_type' => 'serialize',
  ));

  //Create a section
  WPSF::createSection( $prefix, array(
    'fields' => array(
      array(
        'id' => 'example-text',
        'type' => 'text',
        'title' => 'Example Text',
      ),
      array(
        'id' => 'example-textarea',
        'type' => 'textarea',
        'title' => 'Example Textarea',
    )
  ));
}

Extract Option (data_type => serialize)

$term = get_category_by_slug( 'uncategorized' );
$meta = get_term_meta( $term->term_id, 'custom_tax_options', true );

echo $meta['example-text'];
echo $meta['example-textarea'];

Extract Option (data_type => unserialize)

$term = get_category_by_slug( 'uncategorized' );
echo get_term_meta( $term->term_id, 'example-text', true );
echo get_term_meta( $term->term_id, 'example-text', true );