/**
 * Simple boolean helper to check if ACF is on.
 * @return boolean
 */
function is_acf(){
	return function_exists( 'get_field' ) ? true : false;
}

/**
 * Helper function for ACF get_field function
 * @param  string 	$field   	Field name
 * @param  integer 	$post_id 	Optionally pass the post ID
 * @return varies          		Returns contents of get_field
 */
function gf( $field, $post_id = null ) {
	if ( ! is_acf() ) {
		return false;
	}
	if ( get_field( $field, $post_id ) ) {
		return get_field( $field, $post_id );
	} else {
		return false;
	}
}