Add support for multiple custom post type - Author hReview Plugin

review-meta-box.php

<?php

// Add meta box to all post_types
// Customised by Anand Kumar @blogsynthesis.com
function ta_mytheme_post_add_box() {
	global $wpar_meta_box;
	
	$post_types = get_post_types();
	foreach ( $post_types as $post_type ) {
		add_meta_box($wpar_meta_box['id'], $wpar_meta_box['title'], 'ta_mytheme_post_show_box',  $post_type, $wpar_meta_box['context'], $wpar_meta_box['priority']);
	} 
}


// Add meta box to selected post types i.e. post, page and reviews (as shown in the example below)
function ta_mytheme_post_add_box() {
	global $wpar_meta_box;
	$types = array( 'post', 'page', 'reviews' );

	foreach( $types as $type ) {
	add_meta_box($wpar_meta_box['id'], $wpar_meta_box['title'], 'ta_mytheme_post_show_box',  $type, $wpar_meta_box['context'], $wpar_meta_box['priority']);
} }