pluralize.php

<?php
/**
*  PHP pularisation helpers
*
*  Created by dave@freshsauce.co.uk on 2012-09-17.
*/

class Pluralize {
  
  static private  $plural = array(
    array('/(quiz)$/i', "$1zes"),
    array('/^(ox)$/i', "$1en"),
    array('/([m|l])ouse$/i', "$1ice"),
    array('/(matr|vert|ind)ix|ex$/i', "$1ices"),
    array('/(x|ch|ss|sh)$/i', "$1es"),
    array('/([^aeiouy]|qu)y$/i', "$1ies"),
    array('/([^aeiouy]|qu)ies$/i', "$1y"),
    array('/(hive)$/i', "$1s"),
    array('/(?:([^f])fe|([lr])f)$/i', "$1$2ves"),
    array('/sis$/i', "ses"),
    array('/([ti])um$/i', "$1a"),
    array('/(buffal|tomat)o$/i', "$1oes"),
    array('/(bu)s$/i', "$1ses"),
    array('/(alias|status)$/i', "$1es"),
    array('/(octop|vir)us$/i', "$1i"),
    array('/(ax|test)is$/i', "$1es"),
    array('/s$/i', "s"),
    array('/$/', "s")
  );

  static private  $irregular = array(
   array('move', 'moves'),
   array('sex', 'sexes'),
   array('child', 'children'),
   array('man', 'men'),
   array('woman', 'women'),
   array('person', 'people'),
   array('datum', 'data')
  );

  static private $uncountable = array( 
   'sheep',
   'fish',
   'series',
   'species',
   'money',
   'rice',
   'information',
   'equipment'
  );
  
  /**
   * no need for a constructor so private
   *
   */
  private function __construct() {
    # code...
  }
  
  /**
   * given a singular word and a count, returns the pural version of the word if appropriate
   *
   * @param string $string 
   * @param integer $count 
   * @return string original singlular word or pluralised version if appropriate
   */
  static public function pluralize($string, $count = 2) {
    if ($count == 1) return $string; // If only one no need to puralise
    // save some time in the case that singular and plural are the same
    if (in_array(strtolower($string), self::$uncountable))
     return $string;

    // check for irregular singular forms
    foreach (self::$irregular as $noun)
    {
     if (strtolower($string) == $noun[0])
         return $noun[1];
    }

    // check for matches using regular expressions
    foreach (self::$plural as $pattern)
    {
     if (preg_match($pattern[0], $string))
         return preg_replace($pattern[0], $pattern[1], $string);
    }
  
    return $string;
  }
}