Moving Posts between Sites in Multisite Network

add_filter( 'handle_bulk_actions-edit-post', 'misha_bulk_action_multisite_handler', 10, 3 );
 
function misha_bulk_action_multisite_handler( $redirect, $doaction, $object_ids ) {
 
	// we need query args to display correct admin notices
	$redirect = remove_query_arg( array( 'misha_posts_moved', 'misha_blogid' ), $redirect );
 
 	// our actions begin with "move_to_", so let's check if it is a target action
	if( strpos( $doaction, "move_to_" ) === 0 ) {
		$blog_id = str_replace( "move_to_", "", $doaction );
 
		foreach ( $object_ids as $post_id ) {
 
			// get the original post object as an array
			$post = get_post( $post_id, ARRAY_A );
			// if you need to apply terms (more info below the code)
			$post_terms = wp_get_object_terms($post_id, 'category', array('fields' => 'slugs'));
			// get all the post meta
			$data = get_post_custom($post_id);
			// empty ID field, to tell WordPress to create a new post, not update an existing one
			$post['ID'] = '';
 
 
			switch_to_blog( $blog_id );
 
			// insert the post
			$inserted_post_id = wp_insert_post($post); // insert the post
			// update post terms
			wp_set_object_terms($inserted_post_id, $post_terms, 'category', false);
			// add post meta
			foreach ( $data as $key => $values) {
				// if you do not want weird redirects
				if( $key == '_wp_old_slug' ) {
					continue;
				}
				foreach ($values as $value) {
					add_post_meta( $inserted_post_id, $key, $value );
				}
			}
 
			restore_current_blog();
 
			// if you want to copy posts, comment this line
			wp_delete_post( $post_id );
 
		}
 
 
		$redirect = add_query_arg( array(
			'misha_posts_moved' => count( $object_ids ),
			'misha_blogid' => $blog_id
		), $redirect );
 
	}
 
 
	return $redirect;
 
}

add_action( 'admin_notices', 'misha_bulk_multisite_notices' );
 
function misha_bulk_multisite_notices() {
 
	if( ! empty( $_REQUEST['misha_posts_moved'] ) ) {
 
		// because I want to add blog names to notices
		$blog = get_blog_details( $_REQUEST['misha_blogid'] );
 
		// depending on ho much posts were changed, make the message different
		printf( '<div id="message" class="updated notice is-dismissible"><p>' .
			_n( '%d post has been moved to "%s".', '%d posts have been moved to "%s".', intval( $_REQUEST['misha_posts_moved'] )
		) . '</p></div>', intval( $_REQUEST['misha_posts_moved'] ), $blog->blogname );
 
	}
 
}