/**

 * 为WordPress后台的文章、分类等显示ID From wpdaxue.com

 */

// 添加一个新的列 ID

function ssid_column($cols) {

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

	return $cols;

}

// 显示 ID

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;

}

// 为 ID 这列添加css 

function ssid_css() {

?>

<style type="text/css">

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

</style>

<?php	

}

// 通过动作/过滤器输出各种表格和CSS

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');