Easily get post meta values for Custom Metaboxes and Fields plugin

cmb_get_meta.php

<?php
/**
 * Easily get post meta value for Custom Metaboxes and Fields plugin
 *
 * @see https://github.com/jaredatch/Custom-Metaboxes-and-Fields-for-WordPress
 *
 * @param string $key to retrieve
 * @param bool $echo if true then echo value
 * @param string $sanitize_callback sanitize value with this callback
 * @param string $cmb_prefix prefix of post meta
 */
function rk_cmb_get_meta ( $key = '', $echo = false, $sanitize_callback = '', $cmb_post = false, $cmb_prefix = false ) {
	global $prefix, $post;
	$prefix = $cmb_prefix ? $cmb_prefix :  $prefix;
	$cmb_post = is_object( $cmb_post ) ? $cmb_post : $post;
	$value = get_post_meta( intval( $cmb_post->ID ), $prefix . $key, true );
	if( $sanitize_callback && is_callable( $sanitize_callback ) )
		$value = call_user_func( $sanitize_callback, $value );
	if( $echo )
		echo $value;
	else
		return $value;
}