WordPress无插件后台直接显示文章、页面、分类、标签和用户等ID号

有时我们需要查看某篇文章或者分类的ID，需要将鼠标放在文章或者分类名称上，然后查看浏览器状态栏上链接中的数字才能获得ID号，不够直观，可以将下面的代码添加到当前主题 functions.php 文件中，之后会在后台文章、分类等列表后面直接显示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\');

代码来自插件：Simply Show IDs

当然你也可以直接安装该插件。