迟交的答复

更新WordPress 3.5+

我编写了以下插件来扩展WP_List_Table用于具有以下功能的内置和自定义帖子类型：

添加列（如果show_admin_column 设置为false)

add_action( \'plugins_loaded\', array( \'WCM_Admin_PT_List_Tax_Filter\', \'init\' ) );
class WCM_Admin_PT_List_Tax_Filter
{
    private static $instance;

    public $post_type;

    public $taxonomies;

    public $new_cols = array();

    static function init()
    {
        null === self :: $instance AND self :: $instance = new self;
        return self :: $instance;
    }

    public function __construct()
    {
        add_action( \'load-edit.php\', array( $this, \'setup\' ) );
    }

    public function setup()
    {
        add_action( current_filter(), array( $this, \'setup_vars\' ), 20 );
        add_action( \'restrict_manage_posts\', array( $this, \'get_select\' ) );
        add_filter( "manage_taxonomies_for_{$this->post_type}_columns", array( $this, \'add_columns\' ) );
    }

    public function setup_vars()
    {
        $this->post_type  = get_current_screen()->post_type;
        $this->taxonomies = array_diff(
             get_object_taxonomies( $this->post_type )
            ,get_taxonomies( array( \'show_admin_column\' => \'false\' ) )
        );
    }

    public function add_columns( $taxonomies )
    {
        return array_merge(
             $taxonomies
            ,$this->taxonomies
        );
    }

    /**
     * Select form element to filter the post list
     * @return string HTML
     */
    public function get_select()
    {
        $html = \'\';
        foreach ( $this->taxonomies as $tax )
        {
            $options = sprintf(
             \'<option value="">%s %s</option>\'
            ,__( \'View All\' )
                ,get_taxonomy( $tax )->label
            );
            $class = is_taxonomy_hierarchical( $tax ) ? \' class="level-0"\' : \'\';
            foreach ( get_terms( $tax ) as $taxon )
            {
                $options .= sprintf(
                     \'<option %s%s value="%s">%s%s</option>\'
                    ,isset( $_GET[ $tax ] ) ? selected( $taxon->slug, $_GET[ $tax ], false ) : \'\'
                    ,\'0\' !== $taxon->parent ? \' class="level-1"\' : $class
                    ,$taxon->slug
                    ,\'0\' !== $taxon->parent ? str_repeat( \'&nbsp;\', 3 ) : \'\'
                    ,"{$taxon->name} ({$taxon->count})"
                );
            }
            $html .= sprintf(
                \'<select name="%s" id="%s" class="postform">%s</select>\'
                ,$tax
                ,$tax
                ,$options
            );
        }

        return print $html;
    }
}

解释首先，我做了一个很棒的工作，但是做了大量的工作来获取自定义列（不知道show_admin_column). 然后我做了很多parse_query 通过两种分类法对其进行筛选。幸运的是，我立即得到了一个令人惊讶的结果（没有添加代码）。查看以下转储示例：

  public \'tax_query\' => 
    object(WP_Tax_Query)[429]
      public \'queries\' => 
        array (size=2)
          0 => 
            array (size=5)
              \'taxonomy\' => string \'post_format\' (length=11)
              \'terms\' => 
                array (size=1)
                  0 => string \'post-format-gallery\' (length=19)
              \'include_children\' => boolean true
              \'field\' => string \'slug\' (length=4)
              \'operator\' => string \'IN\' (length=2)
          1 => 
            array (size=5)
              \'taxonomy\' => string \'category\' (length=8)
              \'terms\' => 
                array (size=4)
                  0 => int 5
                  1 => int 6
                  2 => int 7
                  3 => int 8
              \'include_children\' => boolean false
              \'field\' => string \'term_id\' (length=7)
              \'operator\' => string \'IN\' (length=2)
      public \'relation\' => string \'AND\' (length=3)

WP已经默认这么做了！