Customizer YES/NO choices

yes-no-choices.php

<?php 
// Sanitize YES/NO choice.
function dbt_yes_no_choices() {
        return apply_filters( 'dbt_yes_no_choices', array(
                'no'     	=> __( 'No' ),
                'yes'       	=> __( 'Yes' ),
        ) );
}

function dbt_sanitize_yes_no_choice( $value ) {
        $choices = dbt_yes_no_choices();

        if ( ! array_key_exists( $value, $choices ) ) {
                $value = 'no';
        }

        return $value;       
}