- var_dump: documentation ( source)
<?php
$a = new \NumberFormatter('en_US', \NumberFormatter::CURRENCY);
$a->setAttribute(\NumberFormatter::MAX_FRACTION_DIGITS, 8);
$a->setSymbol(NumberFormatter::CURRENCY_SYMBOL, ''); // It's empty because I want it "minimal" for a table.
var_dump($a->formatCurrency(0.0043, 'BTC'));