function _views_natural_sort_number_encode_match_callback in Views Natural Sort 7

Same name and namespace in other branches

1. 6 views_natural_sort.module \_views_natural_sort_number_encode_match_callback()

Encodes a string representing numbers into a special format that can be sorted alphanumerically.

Parameters

array $match: array of matches passed from preg_replace_callback $match[0] is the entire matching string $match[1] if present, is the optional dash, preceded by optional whitespace $match[2] if present, is whole number portion of the decimal number $match[3] if present, is the fractional portion of the decimal number $match[4] if present, is the integer (when no fraction is matched)

Return value

string String representing a numerical value that will sort numerically in an alphanumeric search.

1 string reference to '_views_natural_sort_number_encode_match_callback'

views_natural_sort_encode in ./views_natural_sort.module

Encodes a string into an ascii-sortable such:

File

./views_natural_sort.module, line 229

Provides a views filter that sorts titles by a more natural manner by ignoring articles like "The" and "A."

Code

function _views_natural_sort_number_encode_match_callback($match) {

  // Remove commas and leading zeros from whole number
  $whole = (string) (int) str_replace(',', '', isset($match[4]) && strlen($match[4]) > 0 ? $match[4] : $match[2]);

  // Remove traililng 0's from fraction, then add the decimal and one trailing 0
  $fraction = trim('.' . $match[3], '0') . '0';
  $encode = sprintf('%02u', strlen($whole)) . $whole . $fraction;
  if (strlen($match[1])) {

    // Negative number. Make 10's complement. Put back any leading white space and the dash
    // Requires intermediate to avoid double-replacing the same digit. str_replace seems to
    // work by copying the source to the result, then successively replacing within it,
    // rather than replacing from the source to the result.
    $digits = array(
      '0',
      '1',
      '2',
      '3',
      '4',
      '5',
      '6',
      '7',
      '8',
      '9',
    );
    $intermediate = array(
      'a',
      'b',
      'c',
      'd',
      'e',
      'f',
      'g',
      'h',
      'i',
      'j',
    );
    $rev_digits = array(
      '9',
      '8',
      '7',
      '6',
      '5',
      '4',
      '3',
      '2',
      '1',
      '0',
    );
    $encode = $match[1] . str_replace($intermediate, $rev_digits, str_replace($digits, $intermediate, $encode));
  }
  return $encode;
}