Register Meta Boxes

register-meta-boxes-deprecated.php

<?php
// IMPORTANT: This is depracated and not supported any more

// Global variable which stores all meta boxes.
global $meta_boxes;
$meta_boxes   = array();

$prefix = 'rw_';

// 1st meta box
$meta_boxes[] = array(
    'id'         => 'personal',
    'title'      => __( 'Personal Information', 'textdomain' ),
    'post_types' => array( 'post', 'page' ),
	'fields' => array(
        array(
            'name'  => __( 'Full name', 'textdomain' ),
            'desc'  => 'Format: First Last',
            'id'    => $prefix . 'fname',
            'type'  => 'text',
            'std'   => 'Anh Tran',
            'class' => 'custom-class',
            'clone' => true,
        ),
    )
);

// 2nd meta box
$meta_boxes[] = array(
    'title'      => __( 'Media', 'textdomain' ),
    'post_types' => 'movie',
    'fields'     => array(
        array(
            'name' => __( 'URL', 'textdomain' ),
            'id'   => $prefix . 'url',
            'type' => 'text',
        ),
    )
);

function YOURPREFIX_register_meta_boxes() {
	global $meta_boxes;

	if ( ! class_exists( 'RW_Meta_Box' ) )
		return;

	foreach ( $meta_boxes as $meta_box ) {
		new RW_Meta_Box( $meta_box );
	}
}

add_action( 'admin_init', 'YOURPREFIX_register_meta_boxes' );

register-meta-boxes.php

<?php
add_filter( 'rwmb_meta_boxes', 'YOURPREFIX_register_meta_boxes' );

function YOURPREFIX_register_meta_boxes( $meta_boxes ) {
    $prefix = 'rw_';

    // 1st meta box
    $meta_boxes[] = array(
        'id'         => 'personal',
        'title'      => __( 'Personal Information', 'textdomain' ),
        'post_types' => array( 'post', 'page' ),
        'context'    => 'normal',
        'priority'   => 'high',

        'fields' => array(
            array(
                'name'  => __( 'Full name', 'textdomain' ),
                'desc'  => 'Format: First Last',
                'id'    => $prefix . 'fname',
                'type'  => 'text',
                'std'   => 'Anh Tran',
                'class' => 'custom-class',
                'clone' => true,
            ),
        )
    );

    // 2nd meta box
    $meta_boxes[] = array(
        'title'      => __( 'Media', 'textdomain' ),
        'post_types' => 'movie',
        'fields'     => array(
            array(
                'name' => __( 'URL', 'textdomain' ),
                'id'   => $prefix . 'url',
                'type' => 'text',
            ),
        )
    );

    return $meta_boxes;
}