PHP Class for creating interface for assigning term_group in any WordPress taxonomy

Sometimes when developing something on WordPress its necessary to use field term_group from the data base table wp_term_relationships. For example sorting taxonomies terms by this field. But how to assign term_group value to each term when there is no such interface by default? Described below PHP class will help you to resolve this task:

class TaxonomyTermGroup {

	public function init($taxonomies) {
		if (!empty($taxonomies)) {
			foreach ($taxonomies as $taxonomy_name) {
				add_filter('manage_edit-' . $taxonomy_name . '_columns', array(__CLASS__, 'draw_taxonomy_columns'));
				add_filter('manage_' . $taxonomy_name . '_custom_column', array(__CLASS__, 'draw_taxonomy_columns_data'), 5, 3);
				add_action($taxonomy_name . "_edit_form_fields", array(__CLASS__, "edit_form_fields"), 10, 2);
			}
		}
	}

	public static function draw_taxonomy_columns($columns) {
		return array_merge($columns, array('term_group' => __('Term group', '')));
	}

	public static function draw_taxonomy_columns_data($value = '', $column_name = '', $term_id = 0) {
		switch ($column_name) {
			case 'term_group':
				$term = get_term_by('term_id', $term_id, @$_GET['taxonomy']);
				if (is_object($term)) {
					echo $term->term_group;
				} else {
					echo 0;
				}

				break;
		}
	}

	public static function edit_form_fields($term, $taxonomy) {
		?>
		<tr class="form-field form-required">
			<th scope="row" valign="top"><label for="term_group"><?php _e('Term group', '') ?></label></th>
			<td>
				<select name="term_group" id="term_group">
					<?php for ($i = 0; $i < 8; $i++): ?>
						<option value="<?php echo $i ?>" <?php echo($i == $term->term_group ? "selected" : "") ?>><?php echo $i ?></option>
					<?php endfor; ?>
				</select>
			</td>
		</tr>
		<?php
	}

}

class TaxonomyTermGroup {

public function init($taxonomies) {

if (!empty($taxonomies)) {

foreach ($taxonomies as $taxonomy_name) {

add_filter('manage_edit-' . $taxonomy_name . '_columns', array(__CLASS__, 'draw_taxonomy_columns'));

add_filter('manage_' . $taxonomy_name . '_custom_column', array(__CLASS__, 'draw_taxonomy_columns_data'), 5, 3);

add_action($taxonomy_name . "_edit_form_fields", array(__CLASS__, "edit_form_fields"), 10, 2);

}

public static function draw_taxonomy_columns($columns) {

return array_merge($columns, array('term_group' => __('Term group', '')));

}

public static function draw_taxonomy_columns_data($value = '', $column_name = '', $term_id = 0) {

switch ($column_name) {

case 'term_group':

$term = get_term_by('term_id', $term_id, @$_GET['taxonomy']);

if (is_object($term)) {

echo $term->term_group;

} else {

echo 0;

}

break;

}

public static function edit_form_fields($term, $taxonomy) {

<td>

<?php for ($i = 0; $i < 8; $i++): ?>

<option value="<?php echo $i ?>" <?php echo($i == $term->term_group ? "selected" : "") ?>><?php echo $i ?></option>

<?php endfor; ?>

</select>

</td>

</tr>

<?php

}

Using of this class is simple. After code of initialization taxonomies you should add next piece of code:

$taxt=new TaxonomyTermGroup();
$taxt->init(array('clients','skills'));

1 2	$taxt=new TaxonomyTermGroup(); $taxt->init(array('clients','skills'));

clients and skills here is slugs of taxonomies.

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PHP Class for creating interface for assigning term_group in any WordPress taxonomy

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