v0.2.3 2018-09-07 18:37 UTC

This package is auto-updated.

Last update: 2024-04-23 23:03:05 UTC


Read and write .arff files for Weka.

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Developed by Florian Eckerstorfer in Vienna, Europe.


You can install cocur/arff with Composer:

$ composer require cocur/arff


Write .arff file

use Cocur\Arff\Document;
use Cocur\Arff\Column\NumericColumn;
use Cocur\Arff\Column\NominalColumn;

$document = new Document('iris');
$document->addColumn(new NumericColumn('sepallength'));
$document->addColumn(new NumericColumn('sepalwidth'));
$document->addColumn(new NumericColumn('petallength'));
$document->addColumn(new NumericColumn('petalwidth'));
$document->addColumn(new NominalColumn('class', ['Iris-setosa','Iris-versicolor','Iris-virginica']));

$document->addData(['sepallength' => 5.1, 'sepalwidth' => 3.5, 'petallength' => 1.4, 'petalwidth' => 0.2, 'class' => 'Iris-setosa']);

$writer = new Writer();

$writer->render($document);           // returns rendered .arff file
$writer->write($document, 'iris.arff'); // writes .arff file to disk

Read .arff file

use Cocur\Arff\Reader;

$reader = new Reader();
$document = $reader->readFile('irif.arff'); // returns Cocur\Arff\Document

Available types of columns

  • Cocur\Arff\Column\NumericColumn
  • Cocur\Arff\Column\StringColumn
  • Cocur\Arff\Column\NominalColumn
  • Cocur\Arff\Column\DateColumn

Date columns

You can define the date format for date columns. The format is only used to write to the Arff file, you need to convert the date manually before adding the data.

$column = new DateColumn('created', 'yyyy-MM-dd HH:mm:ss');

Plum Integration

cocur/arff contains a writer for Plum.

use Cocur\Arff\Bridge\Plum\ArffWriter;

$writer = new ArffWriter('filename.arff', 'name', [
    new NumericColumn('sepallength'),
    new NumericColumn('sepalwidth'),
    new NumericColumn('petallength'),
    new NumericColumn('petalwidth'),
    new NominalColumn('class', ['Iris-setosa','Iris-versicolor','Iris-virginica']),


Version 0.2.3 (7 September 2018)

  • #3 Support more generic relation name and drops malformed lines (by frantzmiccoli)

Version 0.2.2 (16 March 2018)

  • Case-insensitive parsing of column type

Version 0.2.1 (2 September 2017)

  • Fix parsing of nominal columns

Version 0.2 (2 September 2017)

  • Split ArffFile into Cocur\Arff\Document and Cocur\Arff\Writer
  • Add Cocur\Arff\Reader to read .arff files

Version 0.1 (17 July 2015)

  • Initial release


The MIT license applies to cocur/arff. For the full copyright and license information, please view the LICENSE file distributed with this source code.