CurrencyFilter.php

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<?php
namespace TYPO3\CMS\Form\Filter;

class CurrencyFilter implements \TYPO3\CMS\Form\Filter\FilterInterface {

    protected $decimalsPoint;

    protected $thousandSeparator;

    public function __construct($arguments = array()) {
        $this->setDecimalsPoint($arguments['decimalPoint']);
        $this->setThousandSeparator($arguments['thousandSeparator']);
    }

    public function setDecimalsPoint($decimalsPoint = '.') {
        if (empty($decimalsPoint)) {
            $this->decimalsPoint = '.';
        } else {
            $this->decimalsPoint = (string) $decimalsPoint;
        }
        return $this;
    }

    public function setThousandSeparator($thousandSeparator = ',') {
        if (empty($thousandSeparator)) {
            $this->thousandSeparator = ',';
        } elseif ($thousandSeparator === 'space') {
            $this->thousandSeparator = ' ';
        } elseif ($thousandSeparator === 'none') {
            $this->thousandSeparator = '';
        } else {
            $this->thousandSeparator = (string) $thousandSeparator;
        }
        return $this;
    }

    public function filter($value) {
        $value = str_replace(
            array(
                $this->thousandSeparator,
                $this->decimalsPoint,
            ),
            array(
                '',
                '.'
            ),
            (string)$value
        );

        // replace all non numeric characters, decimalPoint and negative sign
        $value = preg_replace("/[^0-9.-]/", "", $value);
        $value = (double)$value;
        return number_format($value, 2, $this->decimalsPoint, $this->thousandSeparator);
    }

}