public static function singularize($word)
    {

        static::$uncountables = array(
            'equipment', 'information', 'rice', 'money', 'species', 'series', 'fish', 'sheep', 'media'
        );
        static::$irregulars = array(
            'person'  => 'people',
            'man'     => 'men',
            'child'   => 'children',
            'sex'     => 'sexes',
            'move'    => 'moves'
        );
        $lowerCasedWord = strtolower($word);
        foreach (static::$uncountables as $uncountable) {
            if (substr($lowerCasedWord, (-1 * strlen($uncountable))) == $uncountable) {
                return $word;
            }
        }
        foreach (static::$irregulars as $plural => $singular) {
            if (preg_match('/(' . $singular.')$/i', $word, $arr)) {
                return preg_replace(
                    '/(' . $singular . ')$/i',
                    substr($arr[0], 0, 1) . substr($plural, 1),
                    $word
                );
            }
        }
        foreach (static::$singulars as $rule => $replacement) {
            if (preg_match($rule, $word)) {
                return preg_replace($rule, $replacement, $word);
            }
        }

        return $word;
    }