Create english list function

create_english_list.php

<?php
/**
 * Create English List
 * 
 * I wrote this in 2007 for a project I was working on.
 *
 * Converts arrays like (1,2,3) to a list in English like: "1, 2 and 3"
 * If only two array elements exist it returns: "1 and 2"
 * If only one array element exists it returns: "1"
 * If zero array element exists it returns: ""
 * If an array element is an empty string, it is skipped.
 *
 * @param array $array The array to convert.
 * @param bool $oxford Option to put a comma before 'and'. Default False.
 * @param bool $add_quotes Option to show quotes around elems. Default False.
 * @return string Return an English list or empty string if the array is empty.
 */
function create_english_list($array, $oxford=false, $add_quotes=false) {

  $format_str1 = '%s';       

  if ($oxford) {
      $format_str2 = '%s, and %s';
  } else {
      $format_str2 = '%s and %s';
  }

  if ($add_quotes) {
      $array = array_map(create_function('$val', 'return "\"$val\"";'), $array);
  }

  // Filter out strings that don't contain at least one letter or number.
  $array = array_filter($array, create_function('$val',
                      'return preg_replace("/[^a-zA-Z0-9]/", "", $val);'));

  $nelems = count($array);

  if ($nelems == 0) {
      return '';
  } else {
      $last_elem = array_pop($array);
      return vsprintf(/* Format string: */
                      $nelems <= 1 ? $format_str1 : $format_str2, 
                      /* Arguments: */
                      $nelems <= 1 ? $last_elem : array(implode($array, ', '),
                                                        $last_elem)
                     );
  }

}