<?php
$numberFormatter = new NumberFormatter('fr_FR', NumberFormatter::CURRENCY);
// Returns currency symbol for France
echo $numberFormatter->getSymbol(NumberFormatter::CURRENCY_SYMBOL).PHP_EOL;
// GBP - ISO 4217 for Great Britan Pound
$numberFormatter = new NumberFormatter('fr_FR@currency=GBP', NumberFormatter::CURRENCY);
// Returns currency symbol for £ in a format used in France
echo $numberFormatter->getSymbol(NumberFormatter::CURRENCY_SYMBOL);