Sometimes an example says more than a thousand words. Here’s a small plugin that will guide you:
<?php
! defined( 'ABSPATH' ) AND exit;
/**
* Plugin Name: (#65981) »kaiser« Meta Box example
* Plugin URI: http://goo.gl/ls6Q6
* Description: Example showing how to add a meta box with callback args
* Author: Franz Josef Kaiser
* Author URI: http://unserkaiser.com
*/
if ( ! class_exists( 'WPSE65981_MetaBox_Example' ) )
{
add_action( 'load-post.php', array( 'WPSE65981_MetaBox_Example', 'init' ) );
add_action( 'load-post-new.php', array( 'WPSE65981_MetaBox_Example', 'init' ) );
/**
* The Class
*/
class WPSE65981_MetaBox_Example
{
protected static $instance;
public static function init()
{
null === self :: $instance AND self :: $instance = new self;
return self :: $instance;
}
public function __construct()
{
add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ) );
}
/**
* Adds the meta box container
*
* @return void
*/
public function add_meta_box()
{
add_meta_box(
// ID
'wpse65981_meta_box_example'
// Title/"hndle"-bar
,__( 'WPSE Meta Box Headline', 'example_textdomain' )
// Callback
,array( $this, 'render_meta_box_content' )
// post_type
,'post'
// context
,'advanced'
// priority
,'high'
// callback_args
,array( 'Hello', "{$GLOBALS['current_user']->display_name}!" )
);
}
/**
* Render Meta Box content (Callback)
*
* @return void
*/
public function render_meta_box_content( $post, $callback_args )
{
// Argument dump: Uncomment for insights
# var_dump( $post );
# var_dump( $callback_args );
$args = array_map( 'esc_html', $callback_args['args'] );
return print "<h2>".implode( ' ', $args )."</h2>";
}
} // END Class WPSE65981_MetaBox_Example
} // endif;
If you’re wondering, how I identified those hooks that are used for the static init function to load, then take a look at my »current admin info« plugin here.
