# Plucene::Analysis::PorterStemFilter - phpMan

## NAME
    [Plucene::Analysis::PorterStemFilter] - Porter stemming on the token
    stream

## SYNOPSIS
            # isa [Plucene::Analysis]:::TokenFilter

            my $token = $porter_stem_filter->next;

## DESCRIPTION
    This class transforms the token stream as per the Porter stemming
    algorithm.

    Note: the input to the stemming filter must already be in lower case, so
    you will need to use LowerCaseFilter or LowerCaseTokenizer farther down
    the Tokenizer chain in order for this to work properly!

    The Porter Stemmer implements Porter Algorithm for normalization of
    English words by stripping their extensions and is used to generalize
    the searches. For example, the Porter algorithm maps both 'search' and
    'searching' (as well as 'searchnessing') to 'search' such that a query
    for 'search' will also match documents that contains the word
    'searching'.

    Note that the Porter algorithm is specific to the English language and
    may give unpredictable results for other languages. Also, make sure to
    use the same analyzer during the indexing and the searching.

    You can find more information on the Porter algorithm at
    www.tartarus.org/~martin/PorterStemmer.

    A nice online demonstration of the Porter algorithm is available at
    www.scs.carleton.ca/~dquesnel/java/stuff/PorterApplet.html.

## METHODS
  next
            my $token = $porter_stem_filter->next;

    Returns the next input token, after being stemmed.