Change currency position according to currency in wordpress - switch-statement

Question

Googled and searched but I couldn't find what I was looking for.
I am building a woocommerce website which has 2 currencies: KRW and USD.
I have two buttons which switch between these currencies.
When KRW is selected, price display 10,000W and when USD is selected, it displays 100$.
What I want is to display $100 when USD is selected.
I tried in my functions.php:
add_filter('woocommerce_price_format','change_currency_pos');
function change_currency_pos( $currency_pos, $currency ) {
switch( $currency ) {
case 'USD': $currency_pos = '%1$s%2$s'; break;
case 'KRW': $currency_pos = '%2$s%1$s'; break;
}
return $currency_pos;
}
also tried:
function change_currency_pos() {
$currency_pos = get_option('woocommerece_currency');
switch($currency_pos) {
case 'USD': $format = '%1$s%2$s'; break;
case 'KRW': $format = '%2$s%1$s'; break;
}
return $currency_pos;
}
add_filter('woocommerce_price_format','change_currency_pos');
Both didn't work. :(
Can somebody help please. Thank you.

Answer 1

This is just a guess since I don't know what plugin you are using or how it works. I am going to assume that it adds a $_GET variable named currency to the end of your URL. www.example.com&currency=KRW But idea is that you set a value for the woocommerce_currency_pos option based on some data provided by the currency plugin.
add_filter( 'pre_option_woocommerce_currency_pos', 'change_currency_position' );
function change_currency_position(){
if( ! isset( $_GET['currency'] ) {
return false;
}
if ( 'USD' == $_GET['currency'] ){
return 'left';
} elseif ( 'KRW' == $_GET['currency'] ){
return 'right';
}
}
Alternatively, I could assume that "right" is the default currency position. And that you only need to filter the option in the instance where the site is displayed in USD-mode. In which case you would only need the following
add_filter( 'pre_option_woocommerce_currency_pos', 'change_currency_position' );
function change_currency_position(){
if( isset( $_GET['currency'] && 'USD' == $_GET['currency'] ){
return 'left';
}
}

Answer 2

For woocommerce_price_format to work you need to set the format like this
add_filter('woocommerce_price_format', 'woo_custom_format_position', 999, 2);
function woo_custom_format_position($format, $currency_pos)
{
/*'left':$format = '%1$s%2$s';
'right':$format = '%2$s%1$s';
'left_space':$format = '%1$s %2$s';
'right_space':$format = '%2$s %1$s';
*/
$format = '%1$s%2$s';//Change your position
return $format;
}

Answer 3

For some strange reason the 'position' setting wasn't working for EUR currency. I had to add this to my functions.php in order to fix it:
add_filter('woocommerce_price_format', 'woo_custom_format_position', 999, 2);
function woo_custom_format_position($format, $currency_pos)
{
/*'left':$format = '%1$s%2$s';
'right':$format = '%2$s%1$s';
'left_space':$format = '%1$s %2$s';
'right_space':$format = '%2$s %1$s';
*/
switch ($currency_pos) {
case 'left':
return '%1$s%2$s';
case 'right':
return '%2$s%1$s';
case 'left_space':
return '%1$s %2$s';
case 'right_space':
return '%2$s %1$s';
};
}
Now it actually uses the position chosen in the settings.
Hope it helps somebody!