Change postal code to zip code in PMPro

change_postal_code_to_zip_code.php

<?php

/** 
 * This function changes all instances of 'Postal Code' to 'Zip Code' for Paid Memberships Pro.
 * Add this code to your PMPro Customizations plugin - http://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * Visit www.paidmembershipspro.com
 */


function pmpro_change_postal_code_text( $translated_text, $text, $domain ){

	switch ( $translated_text ) {


            case 'Postal Code' :

                $translated_text = __( 'Zip Code', 'pmpro' );
                break;
    }

    return $translated_text;
}

add_filter( 'gettext', 'pmpro_change_postal_code_text', 20, 3 );