/**
  * Create a list of checkboxes that can be used to select additional categories.
  */
 function _generate_additional_categories_checkboxes($override_name = null)
 {
     global $comicpress_manager;
     $additional_categories = array();
     $invalid_ids = array($comicpress_manager->properties['blogcat']);
     foreach ($this->category_tree as $node) {
         $invalid_ids[] = end(explode('/', $node));
     }
     foreach (get_all_category_ids() as $cat_id) {
         if (!in_array($cat_id, $invalid_ids)) {
             $category = get_category($cat_id);
             $additional_categories[strtolower($category->cat_name)] = $category;
         }
     }
     ksort($additional_categories);
     $name = !empty($override_name) ? $override_name : "additional-categories";
     $selected_additional_categories = explode(",", $comicpress_manager->get_cpm_option("cpm-default-additional-categories"));
     $this->category_checkboxes = array();
     if (count($additional_categories) > 0) {
         foreach ($additional_categories as $category) {
             $checked = in_array($category->cat_ID, $selected_additional_categories) ? "checked=\"checked\"" : "";
             $this->category_checkboxes[] = "<label><input id=\"additional-" . $category->cat_ID . "\" type=\"checkbox\" name=\"{$name}[]\" value=\"" . $category->cat_ID . "\" {$checked} /> " . $category->cat_name . "</label><br />";
         }
     }
     return $this->category_checkboxes;
 }

 function form($instance)
 {
     $default = array('title' => 'Widget Demo', 'number_post' => '5', 'current_category' => '');
     // Gộp các giá trị của $default vào $instance để nó trở thành giá trị mặc định
     $instance = wp_parse_args((array) $instance, $default);
     // Gán giá trị ($instance['title'] cho $title (khởi tạo biến $title))
     $title = esc_attr($instance['title']);
     $number_post = esc_attr($instance['number_post']);
     // Get title
     echo "<p>Title:</p>";
     echo "<p><input type=\"text\" name=\"" . $this->get_field_name('title') . "\" value=\"" . $title . "\" /></p>";
     // Select category
     $all_categories = get_all_category_ids();
     echo "<p>Category:</p>";
     echo "<p><select id=\"" . $this->get_field_id('current_category') . "\" name=\"" . $this->get_field_name('current_category') . "\" >";
     foreach ($all_categories as $category) {
         if ($category == $instance['current_category']) {
             echo "<option value=\"" . $category . "\" selected=\"selected\">" . get_cat_name($category) . "</option>";
         } else {
             echo "<option value=\"" . $category . "\">" . get_cat_name($category) . "</option>";
         }
     }
     echo "</select></p>";
     // Get count
     echo "<p>Show number posts:</p>";
     echo "<p><input type=\"text\" name=\"" . $this->get_field_name('number_post') . "\" value=\"" . $number_post . "\" /></p>";
 }

 /**
  * Retrieves a unique array of all Category IDs in the database.
  *
  * @package s2Member\Utilities
  * @since 3.5
  *
  * @uses {@link http://codex.wordpress.org/Function_Reference/get_all_category_ids get_all_category_ids()}
  *
  * @return array Unique array of all Category IDs *(as integers)*.
  */
 public static function get_all_category_ids()
 {
     if (is_array($category_ids = get_all_category_ids())) {
         $category_ids = c_ws_plugin__s2member_utils_arrays::force_integers($category_ids);
     }
     return !empty($category_ids) && is_array($category_ids) ? array_unique($category_ids) : array();
 }

function example_add_dashboard_widgets()
{
    $cat_ids = get_all_category_ids();
    foreach ($cat_ids as $id) {
        $cat = get_category($id);
        wp_add_dashboard_widget($cat->cat_ID, $cat->cat_name, test);
    }
}

function getCatIdsHomepageDefault()
{
    $catids = get_all_category_ids();
    if (count($catids) > 3) {
        return $catids[0] . ',' . $catids[1] . ',' . $catids[2];
    } else {
        return implode(',', $catids);
    }
}

 public static function get_video_category_link()
 {
     $category_ids = get_all_category_ids();
     foreach ($category_ids as $cat_id) {
         if (!strcmp(get_cat_name($cat_id), "video")) {
             echo get_category_link($cat_id);
         }
     }
 }

function ooc_swap_out_checkboxes($content)
{
    $content = str_replace('type="checkbox" name="post_category', 'type="radio" name="post_category', $content);
    // for "Most Used" tab
    foreach (get_all_category_ids() as $i) {
        $content = str_replace('id="in-popular-category-' . $i . '" type="checkbox"', 'id="in-popular-category-' . $i . '" type="radio"', $content);
    }
    return $content;
}

 /**
  * Validate get_all_category_ids
  *
  * @expectedDeprecated get_all_category_ids
  */
 function test_get_all_category_ids()
 {
     // create categories
     self::factory()->category->create_many(2);
     // create new taxonomy to ensure not included
     register_taxonomy('test_tax_cat', 'post');
     wp_insert_term("test1", 'test_tax_cat');
     // Validate length is 1 + created due to uncategorized
     $cat_ids = get_all_category_ids();
     $this->assertEquals(3, count($cat_ids));
 }

function find_category_by_name($name)
{
    $cat = null;
    $category_ids = get_all_category_ids();
    foreach ($category_ids as $cat_id) {
        if (!strcmp(get_cat_name($cat_id), "Blog")) {
            $cat = $cat_id;
        }
    }
    return $cat;
}

function catDropDown($thisCatID)
{
    if ($thisCatID[1] == "0") {
        $thisCatID[1] = 1;
    }
    $category_ids = get_all_category_ids();
    echo '<OPTION  ' . (isset($thisCatID[0]) && is_null($thisCatID[0]) ? 'selected' : '') . '  VALUE=NULL>Not in Use</OPTION>';
    foreach ($category_ids as $cat_id) {
        $cat_name = get_cat_name($cat_id);
        echo '<OPTION  ' . selected(true, in_array($cat_id, $thisCatID), false) . '  VALUE="' . $cat_id . '">' . $cat_name . '</OPTION>';
    }
}

 final function __construct()
 {
     $this->_aOptions = get_option('_syndication');
     if (!empty($this->_aOptions['except_category'])) {
         $this->_aCategory = array_diff(get_all_category_ids(), explode(',', $this->_aOptions['except_category']));
     } else {
         $this->_aCategory = get_all_category_ids();
     }
     $this->_sCategory = implode(',', $this->_aCategory);
     $this->_baseUrl = get_bloginfo('url');
     $this->init();
 }

 /**
  *	Get the categories from blog
  *	@return array ID and category names
  */
 function GetCategories()
 {
     global $wpdb;
     $categories = get_all_category_ids();
     $separator = '|';
     $output = array();
     if ($categories) {
         foreach ($categories as $category) {
             $temp_catname = get_cat_name($category);
             if ($temp_catname !== "Uncategorized") {
                 $output[$category] = $temp_catname;
             }
         }
     } else {
         $output = 'test';
     }
     return $output;
 }

function get_category_children($id, $before = '/', $after = '')
{
    if (0 == $id) {
        return '';
    }
    $chain = '';
    $cat_ids = get_all_category_ids();
    foreach ($cat_ids as $cat_id) {
        if ($cat_id == $id) {
            continue;
        }
        $category = get_category($cat_id);
        if ($category->category_parent == $id) {
            $chain .= $before . $category->cat_ID . $after;
            $chain .= get_category_children($category->cat_ID, $before, $after);
        }
    }
    return $chain;
}

 function form($instance)
 {
     $default = array('number_post_1' => '5', 'current_category_1' => '', 'number_post_2' => '5', 'current_category_2' => '');
     // Initilize default values ($instance)
     $instance = wp_parse_args((array) $instance, $default);
     // Create param, method esc_attr($instance['number_post_1']) : get value number_post_1
     $number_post_1 = esc_attr($instance['number_post_1']);
     $number_post_2 = esc_attr($instance['number_post_2']);
     /* Display column 1  */
     // Select category
     $all_categories = get_all_category_ids();
     echo "<p><strong>COLUMN 1:</strong></p>";
     echo "<p>Category:</p>";
     echo "<p><select id=\"" . $this->get_field_id('current_category_1') . "\" name=\"" . $this->get_field_name('current_category_1') . "\" >";
     foreach ($all_categories as $category) {
         if ($category == $instance['current_category_1']) {
             echo "<option value=\"" . $category . "\" selected=\"selected\">" . get_cat_name($category) . "</option>";
         } else {
             echo "<option value=\"" . $category . "\">" . get_cat_name($category) . "</option>";
         }
     }
     echo "</select></p>";
     // Display number post in a category
     echo "<p>Show number posts:</p>";
     echo "<p><input type=\"text\" name=\"" . $this->get_field_name('number_post_1') . "\" value=\"" . $number_post_1 . "\" /></p>";
     /* Display column 2  */
     // Select category
     echo "<p><strong>COLUMN 2:</strong></p>";
     echo "<p>Category:</p>";
     echo "<p><select id=\"" . $this->get_field_id('current_category_2') . "\" name=\"" . $this->get_field_name('current_category_2') . "\" >";
     foreach ($all_categories as $category) {
         if ($category == $instance['current_category_2']) {
             echo "<option value=\"" . $category . "\" selected=\"selected\">" . get_cat_name($category) . "</option>";
         } else {
             echo "<option value=\"" . $category . "\">" . get_cat_name($category) . "</option>";
         }
     }
     echo "</select></p>";
     // Display number post in a category
     echo "<p>Show number posts:</p>";
     echo "<p><input type=\"text\" name=\"" . $this->get_field_name('number_post_2') . "\" value=\"" . $number_post_2 . "\" /></p>";
 }

 /**
  * Migrate Level Information for all Content to Database
  * @global object $wpdb
  */
 function MigrateContentLevelData()
 {
     ignore_user_abort(true);
     global $wpdb;
     if (get_option($this->PluginOptionName . '_MigrateContentLevelData') == 1) {
         return;
     }
     // migrate category levels
     $content_types = array('MembershipCategories' => '~CATEGORY', 'MembershipPages' => 'page', 'MembershipPosts' => 'post', 'MembershipComments' => '~COMMENT');
     foreach ($content_types as $Option => $content_type) {
         $data = $this->GetOption($Option);
         foreach ($data as $level => $ids) {
             $ids = array_diff(array_unique(explode(',', $ids)), array('0', ''));
             if (count($ids)) {
                 foreach ($ids as $id) {
                     if (is_numeric($id)) {
                         $wpdb->insert($this->Tables->contentlevels, array('content_id' => $id, 'level_id' => $level, 'type' => $content_type), array('%d', '%s', '%s'));
                     }
                 }
             }
         }
     }
     // category protection
     $ids = array_diff(get_all_category_ids(), explode(',', $this->GetOption('CatProtect')));
     if (count($ids)) {
         foreach ($ids as $id) {
             if (is_numeric($id)) {
                 $wpdb->insert($this->Tables->contentlevels, array('content_id' => $id, 'level_id' => 'Protection', 'type' => '~CATEGORY'), array('%d', '%s', '%s'));
             }
         }
     }
     // category protection
     $ids = array_diff(array_unique(explode(',', $this->GetOption('Protect'))), array('0', ''));
     if (count($ids)) {
         foreach ($ids as $id) {
             if (is_numeric($id)) {
                 $wpdb->insert($this->Tables->contentlevels, array('content_id' => $id, 'level_id' => 'Protection', 'type' => 'post'), array('%d', '%s', '%s'));
             }
         }
     }
     update_option($this->PluginOptionName . '_MigrateContentLevelData', 1);
 }

/**
 * Retrieve category children list separated before and after the term IDs.
 *
 * @since 1.2.0
 *
 * @param int $id Category ID to retrieve children.
 * @param string $before Optional. Prepend before category term ID.
 * @param string $after Optional, default is empty string. Append after category term ID.
 * @param array $visited Optional. Category Term IDs that have already been added.
 * @return string
 */
function get_category_children( $id, $before = '/', $after = '', $visited = array() ) {
	if ( 0 == $id )
		return '';

	$chain = '';
	/** TODO: consult hierarchy */
	$cat_ids = get_all_category_ids();
	foreach ( (array) $cat_ids as $cat_id ) {
		if ( $cat_id == $id )
			continue;

		$category = get_category( $cat_id );
		if ( is_wp_error( $category ) )
			return $category;
		if ( $category->parent == $id && !in_array( $category->term_id, $visited ) ) {
			$visited[] = $category->term_id;
			$chain .= $before.$category->term_id.$after;
			$chain .= get_category_children( $category->term_id, $before, $after );
		}
	}
	return $chain;
}

function get_category_children($id, $before = '/', $after = '')
{
    if (0 == $id) {
        return '';
    }
    $chain = '';
    // TODO: consult hierarchy
    $cat_ids = get_all_category_ids();
    foreach ($cat_ids as $cat_id) {
        if ($cat_id == $id) {
            continue;
        }
        $category = get_category($cat_id);
        if (is_wp_error($category)) {
            return $category;
        }
        if ($category->parent == $id) {
            $chain .= $before . $category->term_id . $after;
            $chain .= get_category_children($category->term_id, $before, $after);
        }
    }
    return $chain;
}

 function form($instance)
 {
     $default = array('number_post' => '5', 'current_category' => '');
     // Initilize default values ($instance)
     $instance = wp_parse_args((array) $instance, $default);
     // Create param, method esc_attr($instance['number_post']) : get value number_post
     $number_post = esc_attr($instance['number_post']);
     // Select category
     $all_categories = get_all_category_ids();
     echo "<p>Category:</p>";
     echo "<p><select id=\"" . $this->get_field_id('current_category') . "\" name=\"" . $this->get_field_name('current_category') . "\" >";
     foreach ($all_categories as $category) {
         if ($category == $instance['current_category']) {
             echo "<option value=\"" . $category . "\" selected=\"selected\">" . get_cat_name($category) . "</option>";
         } else {
             echo "<option value=\"" . $category . "\">" . get_cat_name($category) . "</option>";
         }
     }
     echo "</select></p>";
     // Get count
     echo "<p>Show number posts:</p>";
     echo "<p><input type=\"text\" name=\"" . $this->get_field_name('number_post') . "\" value=\"" . $number_post . "\" /></p>";
 }

 function printCategorySelect($selected_id)
 {
     // Get list of category id and names
     $cat_ids = get_all_category_ids();
     foreach ($cat_ids as $cat) {
         $name = get_cat_name($cat);
         if ($selected_id == $cat) {
             $selected = "selected='selected'";
         } else {
             $selected = "";
         }
         echo "  <option value='" . $cat . "' " . $selected . " >" . $name . "</option>\n";
     }
 }

/**
 * Retrieve category children list separated before and after the term IDs.
 *
 * @since 1.2.0
 * @deprecated 2.8.0 Use get_term_children()
 * @see get_term_children()
 *
 * @param int $id Category ID to retrieve children.
 * @param string $before Optional. Prepend before category term ID.
 * @param string $after Optional, default is empty string. Append after category term ID.
 * @param array $visited Optional. Category Term IDs that have already been added.
 * @return string
 */
function get_category_children($id, $before = '/', $after = '', $visited = array())
{
    _deprecated_function(__FUNCTION__, '2.8.0', 'get_term_children()');
    if (0 == $id) {
        return '';
    }
    $chain = '';
    /** TODO: consult hierarchy */
    $cat_ids = get_all_category_ids();
    foreach ((array) $cat_ids as $cat_id) {
        if ($cat_id == $id) {
            continue;
        }
        $category = get_category($cat_id);
        if (is_wp_error($category)) {
            return $category;
        }
        if ($category->parent == $id && !in_array($category->term_id, $visited)) {
            $visited[] = $category->term_id;
            $chain .= $before . $category->term_id . $after;
            $chain .= get_category_children($category->term_id, $before, $after);
        }
    }
    return $chain;
}