View Blog ID in WordPress Multisite

April 5th, 2011 by Frank • WordPress Hacks • 10 Comments

When you work quite a bit with WordPress Multisites, sometimes you need the IDs for some functions or Plugins. The easiest way is via the hover effect with your mouse or you use a little code snippet to add a column with the ID in the table view.



The following code belongs into a Plugin and should be placed in the folder mu-plugins.

class Add_Blog_ID {
	
	public static function init() {
		$class = __CLASS__ ;

		if ( empty( $GLOBALS[ $class ] ) )
			$GLOBALS[ $class ] = new $class;
	}
	
	public function __construct() {
		
		add_filter( 'wpmu_blogs_columns', array( $this, 'get_id' ) );
		add_action( 'manage_sites_custom_column', array( $this, 'add_columns' ), 10, 2 );
		add_action( 'manage_blogs_custom_column', array( $this, 'add_columns' ), 10, 2 );
		add_action( 'admin_footer', array( $this, 'add_style' ) );
	}
	
	public function add_columns( $column_name, $blog_id ) {
		
		if ( 'blog_id' === $column_name )
			echo $blog_id;
		
		return $column_name;
	}

	// Add in a column header
	public function get_id( $columns ) {
		
		$columns['blog_id'] = __('ID');
		
		return $columns;
	}
	
	public function add_style() {
		
		echo '<style>#blog_id { width:7%; }</style>';
	}
}
add_action( 'init', array( 'Add_Blog_ID', 'init' ) );

Alternative you can use the follow plugin with this feature and also list the user ID on network view. You can download the plugin in this GIST 3832632.

8 Comments
  1. Michael Caputo says:
    April 5, 2011 at 2:07 pm

    Hey there, i'd really like to use this, but I don't understand this line: The following code belongs into a Plugin and should be placed in the folder mu-plugins.

    Please clarify?

  2. Brian Krogsgard says:
    April 5, 2011 at 4:01 pm

    Hey Michael,

    The mu-plugins folder is one that operates similarly to the plugins folder, but any plugin in it is automatically activated across your network. It stands for "must-use".

    It is not a folder that comes with your install, so you need to manually create it.

    You can read more about it on Justin Tadlock's article

  3. Frank says:
    April 5, 2011 at 7:27 pm

    @brian: thanks for this great comment to Michaels questions.

  4. Brian Krogsgard says:
    April 5, 2011 at 8:50 pm

    @frank

    No problem : )

    And nice snippet. Bookmarked. I bet I'll be needing this in an upcoming project.

  5. Michael Caputo says:
    April 6, 2011 at 12:36 am

    Thanks for following up. Just a FYI, i didn't recieve a notification that you answered my question even thought I clicked the "Notify me of followup comments" button on the form.. It may have gone to my spam, but just so you know :D

  6. sebastien says:
    April 7, 2011 at 4:25 pm

    i don't understand... there is already a colum with ID : http://archiparmentier.com/admin.jpg

  7. Frank says:
    April 14, 2011 at 7:05 am

    @sebastian: this is not default; maybe you have active a domain-mapping plugin?

  8. sebastien says:
    April 14, 2011 at 11:50 am

    yes franck, that's it, you're right !

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  1. View Blog ID in WordPress Multisite » The Blog of Blogs
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