Price to float

price-to-float.php

// Returns False if no number given, number before decimal is
// missing and when the decimal shorter than two digits
function price_to_float($string)
{
    // Remove leading and trailing whitespace
    $string = trim($string);

    // Check for decimal with comma first
    if ( (bool) preg_match('/[+-]?[0-9]\,[0-9]{2}(\w|\b)/D', $string))
    {
        // Decimal with a comma
        return number_format(filter_var($string, FILTER_SANITIZE_NUMBER_FLOAT) / 100, 2, '.', '');
    }
    
    if ( (bool) preg_match('/[+-]?[0-9]\.[0-9]{2}(\w|\b)/D', $string))
    {
        // Decimal with a dot
        return filter_var($string, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
    }

    if ( ! preg_match('/[\.,]/', $string) && ! ctype_alpha($string))
    {
        return number_format(filter_var($string, FILTER_SANITIZE_NUMBER_FLOAT), 2, '.', '');
    }

    return FALSE;
}