WordPress后台显示文章、分类、页面、标签、评论、用户等的 ID

/**
 * 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');