currencies.php

<?php

$fmt = new NumberFormatter( 'ru_RU', NumberFormatter::CURRENCY );
$fmt->setAttribute(NumberFormatter::FRACTION_DIGITS, 0);
$fmt->setSymbol(NumberFormatter::CURRENCY_SYMBOL, '₽');	
$price = $fmt->formatCurrency($price, "RUR")."\n";

// Function

function beauty_price_value($value = 0, $currency = 'rub') {
  $locale = 'ru_RU';
  $currency_slug = 'RUR';
  
  if($currency == 'usd') {
    $locale = 'en_US';
    $currency_slug = 'USD';
  }
  if($currency == 'eur') {
    $locale = 'en_US';
    $currency_slug = 'EUR';
  }

  $fmt = new NumberFormatter($locale, NumberFormatter::CURRENCY);

  if($currency == 'rub') {
    $fmt->setSymbol(NumberFormatter::CURRENCY_SYMBOL, '₽');
  }

  $fmt->setTextAttribute(NumberFormatter::CURRENCY_CODE, $currency_slug);
  $fmt->setAttribute(NumberFormatter::FRACTION_DIGITS, 0);
  return $fmt->formatCurrency($value, $currency_slug);
}

currency.js

const formatter = new Intl.NumberFormat('ru-RU', {
	style: 'currency',
	currency: 'RUB',
	minimumFractionDigits: 0,
})
const price = formatter.format(val)

// Format to Rubles