The locale code. The only supported locale is "en" (or null using the default locale, i.e. "en")
int
$style
Style of the formatting, one of the format style constants The only currently supported styles are NumberFormatter::DECIMAL and NumberFormatter::CURRENCY.
string
$pattern
Not supported. A pattern string in case $style is NumberFormat::PATTERNDECIMAL or NumberFormat::PATTERNRULEBASED. It must conform to the syntax described in the ICU DecimalFormat or ICU RuleBasedNumberFormat documentation
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