为什么要为代码费心呢？你可以在设置页面中完成。
WooCommerce〉设置〉一般（选项卡）〉货币选项

更新日期：

add_filter('woocommerce_currency_symbol', 'change_existing_currency_symbol', 10, 2);
function change_existing_currency_symbol( $currency_symbol, $currency ) {

    return ( $currency == 'MAD' ) ? $currency : $currency_symbol ;
}

add_filter('woocommerce_currency_symbol', 'change_existing_currency_symbol', 10, 2);

function change_existing_currency_symbol( $currency_symbol, $currency ) {
     switch( $currency ) {
          case 'MAD': $currency_symbol = ' MAD'; break;
     }
     return $currency_symbol;
}

您只需要在主题的functions.php文件中添加几行代码

/**
 * Change a currency symbol
 */
add_filter('woocommerce_currency_symbol', 'change_existing_currency_symbol', 10, 2);

function change_existing_currency_symbol( $currency_symbol, $currency ) {
     switch( $currency ) {
          case 'د.م.': $currency_symbol = 'MAD'; break;
     }
     return $currency_symbol;
}