woocommerce/docs/code-snippets/add-a-currency-symbol.md

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Add a currency and symbol

Add this code to your child themes functions.php file or via a plugin that allows custom functions to be added, such as the Code Snippets plugin. Avoid adding custom code directly to your parent themes functions.php file, as this will be wiped entirely when you update the theme.

if ( ! function_exists( 'YOUR_PREFIX_add_currency_name' ) ) {
  /**
   * Add custom currency
   * 
   * @param array $currencies Existing currencies.
   * @return array $currencies Updated currencies.
   */
  function YOUR_PREFIX_add_currency_name( $currencies ) {
    $currencies['ABC'] = __( 'Currency name', 'YOUR-TEXTDOMAIN' );

    return $currencies;
  }
  add_filter( 'woocommerce_currencies', 'YOUR_PREFIX_add_currency_name' );
}

if ( ! function_exists( 'YOUR_PREFIX_add_currency_symbol' ) ) {
  /**
   * Add custom currency symbol
   * 
   * @param string $currency_symbol Existing currency symbols.
   * @param string $currency Currency code.
   * @return string $currency_symbol Updated currency symbol(s).
   */
  function YOUR_PREFIX_add_currency_symbol( $currency_symbol, $currency ) {
    switch( $currency ) {
      case 'ABC': $currency_symbol = '$'; break;
    }

    return $currency_symbol;
  }
  add_filter('woocommerce_currency_symbol', 'YOUR_PREFIX_add_currency_symbol', 10, 2);
}