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/**
 * Format a number with grouped thousands like 8B, 23M, 50K.
 * @param float $number The number being formatted.
 * @param integer $decimals Sets the number of decimal points.
 * @param string $dec_point Sets the separator for the decimal point.
 * @param string $thousands_sep Sets the thousands separator.
 * @return string A formatted version of number.
 */
function custom_number_format($number, $decimals = 0, $dec_point = '.', $thousands_sep = ' ') {
  if (is_numeric($number)) {
    if ($number < 1000) {
      // Anything less than a thousand
      $formatted = number_format($number);
    }
    else if ($number < 1000000) {
      // Anything less than a million
      $formatted = number_format($number / 1000, $decimals, $dec_point, $thousands_sep) . 'K';
    }
    else if ($number < 1000000000) {
      // Anything less than a billion
      $formatted = number_format($number / 1000000, $decimals, $dec_point, $thousands_sep) . 'M';
    }
    else {
      // At least a billion
      $formatted = number_format($number / 1000000000, $decimals, $dec_point, $thousands_sep) . 'B';
    }
    return $formatted;
  }
  return $number;
}