you can save it as a regular decimal field in the database and format the European style number when displaying it
edit: just added an example of how this can be achieved
$european_numbers = array('123.345,78', '123 456,78', ',78');
foreach($european_numbers as $number) {
echo "$number was converted to ".convert_european_to_decimal($number)."\n";
}
function convert_european_to_decimal($number) {
$number = str_replace('.', '', $number);
$number = str_replace(' ', '', $number);
$number = str_replace(',', '.', $number);
return $number;
}
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