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run code in 200+ php & hhvm versions
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<?php $formatter = new NumberFormatter('en_US', NumberFormatter::CURRENCY); echo $formatter->formatCurrency(212121212, 'USD'), PHP_EOL;
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.2.9
$212,121,212.00