WordPress后台直接显示文章、页面、分类、标签和用户等ID号

    // Prepend the new column to the columns array

    function ssid_column($cols) {

        $cols['ssid'] = 'ID';

        return $cols;

    }

    // Echo the ID for the new column

    function ssid_value($column_name, $id) {

        if ($column_name == 'ssid')

            echo $id;

    }

    function ssid_return_value($value, $column_name, $id) {

        if ($column_name == 'ssid')

            $value = $id;

        return $value;

    }

    // Output CSS for width of new column

    function ssid_css() {

    ?>

    <style type="text/css">

        #ssid { width: 50px; } /* Simply Show IDs */

    </style>

    <?php

    }

    // Actions/Filters for various tables and the css output

    function ssid_add() {

        add_action('admin_head', 'ssid_css');

        add_filter('manage_posts_columns', 'ssid_column');

        add_action('manage_posts_custom_column', 'ssid_value', 10, 2);

        add_filter('manage_pages_columns', 'ssid_column');

        add_action('manage_pages_custom_column', 'ssid_value', 10, 2);

        add_filter('manage_media_columns', 'ssid_column');

        add_action('manage_media_custom_column', 'ssid_value', 10, 2);

        add_filter('manage_link-manager_columns', 'ssid_column');

        add_action('manage_link_custom_column', 'ssid_value', 10, 2);

        add_action('manage_edit-link-categories_columns', 'ssid_column');

        add_filter('manage_link_categories_custom_column', 'ssid_return_value', 10, 3);

        foreach ( get_taxonomies() as $taxonomy ) {

            add_action("manage_edit-${taxonomy}_columns", 'ssid_column');

            add_filter("manage_${taxonomy}_custom_column", 'ssid_return_value', 10, 3);

        }

        add_action('manage_users_columns', 'ssid_column');

        add_filter('manage_users_custom_column', 'ssid_return_value', 10, 3);

        add_action('manage_edit-comments_columns', 'ssid_column');

        add_action('manage_comments_custom_column', 'ssid_value', 10, 2);

    }

    add_action('admin_init', 'ssid_add');