Creating meta boxes

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To create a meta box, you need to hook to the filter rwmb_meta_boxes to add meta box settings. This filter accepts 1 parameter - the array of meta box settings.

The code below registers a simple meta box:

add_filter( 'rwmb_meta_boxes', 'prefix_register_meta_boxes' );
function prefix_register_meta_boxes( $meta_boxes ) {
    $prefix = 'field_prefix_';
    $meta_boxes[] = array(
        'id'         => 'personal',
        'title'      => 'Personal Information',
        'post_types' => 'post',
        'context'    => 'normal',
        'priority'   => 'high',

        'fields' => array(
                'name'  => 'Full name',
                'desc'  => 'Format: {First Name} {Last Name}',
                'id'    => $prefix . 'name',
                'type'  => 'text',

    // Add more meta boxes if you want
    // $meta_boxes[] = ...

    return $meta_boxes;

Meta box settings

Each meta box has the following settings:

Name Description
id Meta box ID. Optional. If it’s absent, it will be generated from title using sanitize_title function.
title Meta box title. Required.
post_types Custom post types which the meta box is for. There can be an array of multiple custom post types or a string for the single post type. Must be in lowercase (like the slug). Optional. Default: post.
context Where the meta box is displayed (normal - below the post editor, advanced - below the normal section or side - on the right sidebar). Optional. Default: normal.
priority Priority within the context where the box is displayed (high or low). Optional. Default: high.
default_hidden Hide the meta box by default (true or false)? The meta box can be toggled using the checkbox option in screen Help (on the top right). Optional. Default false.
autosave Auto save the custom fields’ values (like post content and title)? Optional. Default: false.
fields Array of fields. See section below.


Fields are added to a meta box via the key fields. Each field is an array of settings. In the example above, the text field is defined via:

    'name'  => 'Full name',
    'desc'  => 'Format: {First Name} {Last Name}',
    'id'    => $prefix . 'name',
    'type'  => 'text',

Meta Box supports more than 40 field types. All fields share some common settings like id, type, but also offer unique settings per field type. See this guide for more details.

Field ID is used as the meta key and the field value is used as the meta value when saving into the post meta table.

In the example above, we use a $prefix for field ID. Although it’s not mandatory, it’s recommended to use a prefix to prevent from using the same field id with other scripts.

Use underscore (_) at the beginning to make the fields hidden, e.g. they won’t show in the default WordPress Custom Fields meta box.