Rake PHP

A PHP implementation of the Rapid Automatic Keyword Extraction (RAKE) algorithm for extracting relevant keywords from individual documents.

Installation

You can install the package via composer:

composer require kudashevs/rake-php

Example

Here is a common usage example:

use Kudashevs\RakePhp\Rake;

$text = "Compatibility of systems of linear constraints over the set of natural numbers.";
$text .= "Criteria of compatibility of a system of linear Diophantine equations, strict inequations, and nonstrict inequations are considered.";
$text .= "Upper bounds for components of a minimal set of solutions and algorithms of construction of minimal generating sets of solutions for all types of systems are given.";
$text .= "These criteria and the corresponding algorithms for constructing a minimal supporting set of solutions can be used in solving all the considered types of systems and systems of mixed types";

$rake = new Rake();
$keywords = $rake->extract($text);

print_r($keywords);
// will result in
Array
(
    [minimal generating sets] => 8.6666666666667
    [linear diophantine equations] => 8.5
    [minimal supporting set] => 7.6666666666667
    [minimal set] => 4.6666666666667
    [linear constraints] => 4.5
    [natural numbers] => 4
    [strict inequations] => 4
    [nonstrict inequations] => 4
    [upper bounds] => 4
    [mixed types] => 3.6666666666667
    [considered types] => 3.1666666666667
    [set] => 2
    [types] => 1.6666666666667
    [considered] => 1.5
    [compatibility] => 1
    [systems] => 1
    [criteria] => 1
    [system] => 1
    [components] => 1
    [solutions] => 1
    [algorithms] => 1
    [construction] => 1
    [constructing] => 1
    [solving] => 1
)

More information about RAKE and its usage, you can find in the original paper.

Options

The Rake class accepts some configuration options:

'modifiers' => []               # A string, an instance or an array of Modifiers
'stoplist' => Stoplist::class   # A Stoplist instance that provides a list of stop words
'sorter' => Sorter::class       # A Sorter instance that sorts the output of the algorithm
'exclude' => []                 # An array of words or regex that will be excluded from a stoplist
'include' => []                 # An array of words or regexes that will be included in a stoplist

Note: the configuration options exclude and include accept simple regexes.

Note: the configuration option exclude has a higher priority than the include option.

Note: At the moment of instantiation, the Rake class can throw an InvalidOptionType exception. This exception extends a built-in InvalidArgumentException class, so it is easy to deal with.

Simple regular expressions

The configuration options exclude and include accept regular expressions. The current expressions are currently supported:

• .+(ly) - a one or more match with grouping
• word(s) - a match with alternation at the end of a word
• (word|letter) - an alternation of words

Testing

composer test

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Note: Please make sure to update tests as appropriate.

License

The MIT License (MIT). Please see the License file for more information.