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PHP Stanford Core NLP Adapter: Natural language processing using Stanford server

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Description 

Author

This class can perform natural language processing using Stanford server.

It can take text sentences in natural language and processes them by sending HTTP requests to a Java server that runs locally the Stanford NLP server.

The class and extract the tree of a parsed sentence, get a tree that combines depth and parent information with the tokens, and return a flat sentence tree as a single array.

Innovation Award
PHP Programming Innovation award nominee
December 2016
Number 10


Prize: One downloadable copy of Komodo IDE
Natural language processing is field of computer science that focus on tasks like understanding the meaning of sentences written by humans and do something useful with it.

This package provides the possibilities of Natural Language Processing by making API call to a copy of the Stanford Natural Language Processing server installed locally on the same network that PHP is running.

Manuel Lemos
Picture of Dennis de Swart
Name: Dennis de Swart <contact>
Classes: 3 packages by
Country: The Netherlands The Netherlands
Age: ???
All time rank: 300582 in The Netherlands The Netherlands
Week rank: 91 Up2 in The Netherlands The Netherlands Up
Innovation award
Innovation award
Nominee: 2x

Example

<?php

/**
 * Important notes:
 * - To use the online API : set ONLINE_API to TRUE
 * - To use Java CoreNLP : set ONLINE_API to FALSE
 *
 * - ONLINE_API is set to FALSE by default. You can change this setting in "bootstrap.php"
 * - OpenIE annotator is only available on the Java version
 */

   
require_once __DIR__.'/bootstrap.php'; // bootstrap also contains the config
   
/**
 * Demo usage
 */
   
    // instantiate the class
   
$coreNLP = new CorenlpAdapter();

   
$text1 = 'I will meet Mary in New York at 10pm';
   
$coreNLP->getOutput($text1);

   
// Second text
   
$text2 = 'The Golden Gate Bridge was designed by Joseph Strauss.';
   
$coreNLP->getOutput($text2);
   
/**
 * Display result
 */
   
    // this makes it easier to read
   
echo '<pre>';

   
// show complete output
   
headerText('The "Server Memory Object" (below) contains all the server output');
   
print_r($coreNLP->serverMemory);

   
// first text tree
   
headerText('FIRST TEXT: Part-Of-Speech tree');
   
print_r($coreNLP->trees[0]);

   
// second text tree
   
headerText('SECOND TEXT: Part-Of-Speech tree');
   
print_r($coreNLP->trees[1]);
   
   
// get IDs for a tree
   
headerText('EVERY TREE HAS UNIQUE IDs: this shows the Word-tree-IDs for the second tree');
   
print_r($coreNLP->getWordValues($coreNLP->trees[1]));

   
// this is just a helper function for a nice header
   
function headerText($header){
            echo
'<br />***'.str_repeat('*', strlen($header)).'***<br />';
            echo
'** '.$header.' **<br />';
            echo
'***'.str_repeat('*', strlen($header)).'***<br /><br />';
    }
   
   


Details

PHP Stanford CoreNLP adapter

Version Total Downloads Maintenance Minimum PHP Version License

PHP adapter for use with Stanford CoreNLP

Features

  • Connect to Stanford University CoreNLP API online
  • Connect to Stanford CoreNLP 3.7.0 server
  • Annotators available: tokenize,ssplit,pos, parse, depparse, ner, regexner,lemma, mention, natlog, coref, openie, kbp
  • The package creates Part-Of-Speech Trees with depth, parent- and child ID

Requirements

  • PHP 5.5 or higher: it also works on PHP 7
  • Windows or Linux 64-bit, 8Gb memory or more recommended
  • Either Guzzle HTTP Client (installed by default) or only cURL.
  • Composer for PHP
    https://getcomposer.org/
    

Update 24th February 2018

PHP7 Type hinting removed, because it was causing issues for some users.

Update 28th January 2019

Fixed issue with PHP 7.1 upwards

Installation using ZIP files

  • Install Stanford CoreNLP Server. See the installation walkthrough below.
  • Download and unpack the files from this package.
  • Copy the files to your to your webserver directory. Usually "htdocs" or "var/www".
  • Run a Composer update

Installation using Composer

  • Insert the following line into the "require" of your "composer.json" file.
    {
        "require": {
            "dennis-de-swart/php-stanford-corenlp-adapter": "*"
        }
    }

  • Run a composer update

Using the Stanford CoreNLP online API service

The adapter by default uses Stanford's online API service. This should work right after the composer update. Note that the online API is a public service. If you want to analyze large volumes of text or sensitive data, please install the Java server version.

OpenIE

OpenIE creates "subject-relation-object" tuples. This is similar (but not the same) as the "Subject-Verb-Object" concept of the English language.

Notes: - OpenIE is only available on the Java offline version, not with the "online" mode. See the installation walkthrough below - OpenIE data is not always available. Sometimes the result array might show empty, this is not an error.

http://nlp.stanford.edu/software/openie.html
https://en.wikipedia.org/wiki/Subject-verb-object

Installation / Walkthrough for Java server version

Step 1: install Java

https://java.com/en/download/help/index_installing.xml?os=All+Platforms&j=8&n=20

Step 2: installing the Stanford CoreNLP 3.7.0 server

http://stanfordnlp.github.io/CoreNLP/index.html#download

Step 3: Port for server

Default port for the Java server is port 9000. If port 9000 is not available you can change the port in the "bootstrap.php" file. Example:

define('CURLURL' , 'http://localhost:9000/');

Step 4: Start the CoreNLP serve from the command line.

Go to the download directory, then enter the following command:

java -mx8g -cp "*" edu.stanford.nlp.pipeline.StanfordCoreNLPServer -port 9000

Important note: the Stanford manual says "-mx4g", however I found that this can lead to a Java OutOfMemory error. It is also important to use a 64-bit operating system with at enough memory (8Gb or more recommended)

Step 5: Test if the server has started by surfing to it's URL

http://localhost:9000/

When you surf to this URL, you should see the CoreNLP GUI. If you have problems with installation you can check the manual:

http://stanfordnlp.github.io/CoreNLP/corenlp-server.html

Step 6: Set ONLINE_API to FALSE

In "bootstrap.php" set define('ONLINE_API' , FALSE). This tells the Adapter to use the Java version

Usage examples

Instantiate the adapter:

$coreNLP = new CorenlpAdapter();

To process a text, call the "getOutput" method:

 $text = 'The Golden Gate Bridge was designed by Joseph Strauss.'; 
 $coreNLP->getOutput($text);

Note that the first time that you process a text, the server takes about 20 to 30 seconds extra to load definitions. All other calls to the server after that will be much faster. Small texts are usually processed within seconds.

The results

If successful the following properties will be available:

 $coreNLP->serverMemory;      //contains all of the server output
 $coreNLP->trees;             //contains processed flat trees. Each part of the tree is assigned an ID key
 
 $coreNLP->getWordValues($coreNLP->trees[1])  // get just the words from a tree

Diagram A: Tree With Tokens

Array
(
    [1] => Array
        (
            [parent] => 
            [pennTreebankTag] => ROOT
            [depth] => 0
        )

    [2] => Array
        (
            [parent] => 1
            [pennTreebankTag] => S
            [depth] => 2
        )

    [3] => Array
        (
            [parent] => 2
            [pennTreebankTag] => NP
            [depth] => 4
        )

    [4] => Array
        (
            [parent] => 3
            [pennTreebankTag] => PRP
            [depth] => 6
            [word] => I
            [index] => 1
            [originalText] => I
            [lemma] => I
            [characterOffsetBegin] => 0
            [characterOffsetEnd] => 1
            [pos] => PRP
            [ner] => O
            [before] => 
            [after] =>  
            [openIE] => Array
                (
                    [0] => subject
                    [1] => subject
                    [2] => subject
                )

        )

    [5] => Array
        (
            [parent] => 2
            [pennTreebankTag] => VP
            [depth] => 4
        )

    [6] => Array
        (
            [parent] => 5
            [pennTreebankTag] => MD
            [depth] => 6
            [word] => will
            [index] => 2
            [originalText] => will
            [lemma] => will
            [characterOffsetBegin] => 2
            [characterOffsetEnd] => 6
            [pos] => MD
            [ner] => O
            [before] =>  
            [after] =>  
            [openIE] => Array
                (
                    [0] => subject
                    [1] => subject
                    [2] => relation
                )

        )

    [7] => Array
        (
            [parent] => 5
            [pennTreebankTag] => VP
            [depth] => 6
        )

    [8] => Array
        (
            [parent] => 7
            [pennTreebankTag] => VB
            [depth] => 8
            [word] => meet
            [index] => 3
            [originalText] => meet
            [lemma] => meet
            [characterOffsetBegin] => 7
            [characterOffsetEnd] => 11
            [pos] => VB
            [ner] => O
            [before] =>  
            [after] =>  
            [openIE] => Array
                (
                    [0] => subject
                    [1] => subject
                    [2] => relation
                )

        )

    [9] => Array
        (
            [parent] => 7
            [pennTreebankTag] => NP
            [depth] => 8
        )

    [10] => Array
        (
            [parent] => 9
            [pennTreebankTag] => NP
            [depth] => 10
        )

    [11] => Array
        (
            [parent] => 10
            [pennTreebankTag] => NNP
            [depth] => 12
            [word] => Mary
            [index] => 4
            [originalText] => Mary
            [lemma] => Mary
            [characterOffsetBegin] => 12
            [characterOffsetEnd] => 16
            [pos] => NNP
            [ner] => PERSON
            [before] =>  
            [after] =>  
            [openIE] => Array
                (
                    [1] => subject
                    [2] => object
                    [3] => subject
                    [0] => subject
                )

        )

    [12] => Array
        (
            [parent] => 9
            [pennTreebankTag] => PP
            [depth] => 10
        )

    [13] => Array
        (
            [parent] => 12
            [pennTreebankTag] => IN
            [depth] => 12
            [word] => in
            [index] => 5
            [originalText] => in
            [lemma] => in
            [characterOffsetBegin] => 17
            [characterOffsetEnd] => 19
            [pos] => IN
            [ner] => O
            [before] =>  
            [after] =>  
            [openIE] => Array
                (
                    [1] => relation
                    [3] => relation
                    [0] => relation
                )

        )

    [14] => Array
        (
            [parent] => 12
            [pennTreebankTag] => NP
            [depth] => 12
        )

    [15] => Array
        (
            [parent] => 14
            [pennTreebankTag] => NNP
            [depth] => 14
            [word] => New
            [index] => 6
            [originalText] => New
            [lemma] => New
            [characterOffsetBegin] => 20
            [characterOffsetEnd] => 23
            [pos] => NNP
            [ner] => LOCATION
            [before] =>  
            [after] =>  
            [openIE] => Array
                (
                    [1] => relation
                    [3] => object
                    [0] => object
                )

        )

    [16] => Array
        (
            [parent] => 14
            [pennTreebankTag] => NNP
            [depth] => 14
            [word] => York
            [index] => 7
            [originalText] => York
            [lemma] => York
            [characterOffsetBegin] => 24
            [characterOffsetEnd] => 28
            [pos] => NNP
            [ner] => LOCATION
            [before] =>  
            [after] =>  
            [openIE] => Array
                (
                    [1] => object
                    [3] => object
                )

        )

    [17] => Array
        (
            [parent] => 7
            [pennTreebankTag] => PP
            [depth] => 8
        )

    [18] => Array
        (
            [parent] => 17
            [pennTreebankTag] => IN
            [depth] => 10
            [word] => at
            [index] => 8
            [originalText] => at
            [lemma] => at
            [characterOffsetBegin] => 29
            [characterOffsetEnd] => 31
            [pos] => IN
            [ner] => O
            [before] =>  
            [after] =>  
            [openIE] => Array
                (
                    [1] => object
                )

        )

    [19] => Array
        (
            [parent] => 17
            [pennTreebankTag] => NP
            [depth] => 10
        )

    [20] => Array
        (
            [parent] => 19
            [pennTreebankTag] => CD
            [depth] => 12
            [word] => 10pm
            [index] => 9
            [originalText] => 10pm
            [lemma] => 10pm
            [characterOffsetBegin] => 32
            [characterOffsetEnd] => 36
            [pos] => CD
            [ner] => TIME
            [normalizedNER] => T22:00
            [before] =>  
            [after] => 
            [timex] => Array
                (
                    [tid] => t1
                    [type] => TIME
                    [value] => T22:00
                )

            [openIE] => Array
                (
                    [0] => object
                    [1] => object
                )

        )

)

*

Diagram B: The ServerMemory contains all the server data

*

Array
(
    [0] => Array
        (
            [sentences] => Array
                (
                    [0] => Array
                        (
                            [index] => 0
                            [parse] => (ROOT
  (S
    (NP (PRP I))
    (VP (MD will)
      (VP (VB meet)
        (NP
          (NP (NNP Mary))
          (PP (IN in)
            (NP (NNP New) (NNP York))))
        (PP (IN at)
          (NP (CD 10pm)))))))
                            [basic-dependencies] => Array
                                (
                                    [0] => Array
                                        (
                                            [dep] => ROOT
                                            [governor] => 0
                                            [governorGloss] => ROOT
                                            [dependent] => 3
                                            [dependentGloss] => meet
                                        )

                                    [1] => Array
                                        (
                                            [dep] => nsubj
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 1
                                            [dependentGloss] => I
                                        )

                                    [2] => Array
                                        (
                                            [dep] => aux
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 2
                                            [dependentGloss] => will
                                        )

                                    [3] => Array
                                        (
                                            [dep] => dobj
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 4
                                            [dependentGloss] => Mary
                                        )

                                    [4] => Array
                                        (
                                            [dep] => case
                                            [governor] => 7
                                            [governorGloss] => York
                                            [dependent] => 5
                                            [dependentGloss] => in
                                        )

                                    [5] => Array
                                        (
                                            [dep] => compound
                                            [governor] => 7
                                            [governorGloss] => York
                                            [dependent] => 6
                                            [dependentGloss] => New
                                        )

                                    [6] => Array
                                        (
                                            [dep] => nmod
                                            [governor] => 4
                                            [governorGloss] => Mary
                                            [dependent] => 7
                                            [dependentGloss] => York
                                        )

                                    [7] => Array
                                        (
                                            [dep] => case
                                            [governor] => 9
                                            [governorGloss] => 10pm
                                            [dependent] => 8
                                            [dependentGloss] => at
                                        )

                                    [8] => Array
                                        (
                                            [dep] => nmod
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 9
                                            [dependentGloss] => 10pm
                                        )

                                )

                            [collapsed-dependencies] => Array
                                (
                                    [0] => Array
                                        (
                                            [dep] => ROOT
                                            [governor] => 0
                                            [governorGloss] => ROOT
                                            [dependent] => 3
                                            [dependentGloss] => meet
                                        )

                                    [1] => Array
                                        (
                                            [dep] => nsubj
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 1
                                            [dependentGloss] => I
                                        )

                                    [2] => Array
                                        (
                                            [dep] => aux
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 2
                                            [dependentGloss] => will
                                        )

                                    [3] => Array
                                        (
                                            [dep] => dobj
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 4
                                            [dependentGloss] => Mary
                                        )

                                    [4] => Array
                                        (
                                            [dep] => case
                                            [governor] => 7
                                            [governorGloss] => York
                                            [dependent] => 5
                                            [dependentGloss] => in
                                        )

                                    [5] => Array
                                        (
                                            [dep] => compound
                                            [governor] => 7
                                            [governorGloss] => York
                                            [dependent] => 6
                                            [dependentGloss] => New
                                        )

                                    [6] => Array
                                        (
                                            [dep] => nmod:in
                                            [governor] => 4
                                            [governorGloss] => Mary
                                            [dependent] => 7
                                            [dependentGloss] => York
                                        )

                                    [7] => Array
                                        (
                                            [dep] => case
                                            [governor] => 9
                                            [governorGloss] => 10pm
                                            [dependent] => 8
                                            [dependentGloss] => at
                                        )

                                    [8] => Array
                                        (
                                            [dep] => nmod:at
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 9
                                            [dependentGloss] => 10pm
                                        )

                                )

                            [collapsed-ccprocessed-dependencies] => Array
                                (
                                    [0] => Array
                                        (
                                            [dep] => ROOT
                                            [governor] => 0
                                            [governorGloss] => ROOT
                                            [dependent] => 3
                                            [dependentGloss] => meet
                                        )

                                    [1] => Array
                                        (
                                            [dep] => nsubj
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 1
                                            [dependentGloss] => I
                                        )

                                    [2] => Array
                                        (
                                            [dep] => aux
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 2
                                            [dependentGloss] => will
                                        )

                                    [3] => Array
                                        (
                                            [dep] => dobj
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 4
                                            [dependentGloss] => Mary
                                        )

                                    [4] => Array
                                        (
                                            [dep] => case
                                            [governor] => 7
                                            [governorGloss] => York
                                            [dependent] => 5
                                            [dependentGloss] => in
                                        )

                                    [5] => Array
                                        (
                                            [dep] => compound
                                            [governor] => 7
                                            [governorGloss] => York
                                            [dependent] => 6
                                            [dependentGloss] => New
                                        )

                                    [6] => Array
                                        (
                                            [dep] => nmod:in
                                            [governor] => 4
                                            [governorGloss] => Mary
                                            [dependent] => 7
                                            [dependentGloss] => York
                                        )

                                    [7] => Array
                                        (
                                            [dep] => case
                                            [governor] => 9
                                            [governorGloss] => 10pm
                                            [dependent] => 8
                                            [dependentGloss] => at
                                        )

                                    [8] => Array
                                        (
                                            [dep] => nmod:at
                                            [governor] => 3
                                            [governorGloss] => meet
                                            [dependent] => 9
                                            [dependentGloss] => 10pm
                                        )

                                )

                            [openie] => Array
                                (
                                    [0] => Array
                                        (
                                            [subject] => I
                                            [subjectSpan] => Array
                                                (
                                                    [0] => 0
                                                    [1] => 1
                                                )

                                            [relation] => will meet Mary at
                                            [relationSpan] => Array
                                                (
                                                    [0] => 1
                                                    [1] => 3
                                                )

                                            [object] => 10pm
                                            [objectSpan] => Array
                                                (
                                                    [0] => 8
                                                    [1] => 9
                                                )

                                        )

                                    [1] => Array
                                        (
                                            [subject] => I
                                            [subjectSpan] => Array
                                                (
                                                    [0] => 0
                                                    [1] => 1
                                                )

                                            [relation] => will meet
                                            [relationSpan] => Array
                                                (
                                                    [0] => 1
                                                    [1] => 3
                                                )

                                            [object] => Mary in New York
                                            [objectSpan] => Array
                                                (
                                                    [0] => 3
                                                    [1] => 7
                                                )

                                        )

                                    [2] => Array
                                        (
                                            [subject] => I
                                            [subjectSpan] => Array
                                                (
                                                    [0] => 0
                                                    [1] => 1
                                                )

                                            [relation] => will meet
                                            [relationSpan] => Array
                                                (
                                                    [0] => 1
                                                    [1] => 3
                                                )

                                            [object] => Mary
                                            [objectSpan] => Array
                                                (
                                                    [0] => 3
                                                    [1] => 4
                                                )

                                        )

                                    [3] => Array
                                        (
                                            [subject] => Mary
                                            [subjectSpan] => Array
                                                (
                                                    [0] => 3
                                                    [1] => 4
                                                )

                                            [relation] => is in
                                            [relationSpan] => Array
                                                (
                                                    [0] => 4
                                                    [1] => 5
                                                )

                                            [object] => New York
                                            [objectSpan] => Array
                                                (
                                                    [0] => 5
                                                    [1] => 7
                                                )

                                        )

                                )

                            [tokens] => Array
                                (
                                    [0] => Array
                                        (
                                            [index] => 1
                                            [word] => I
                                            [originalText] => I
                                            [lemma] => I
                                            [characterOffsetBegin] => 0
                                            [characterOffsetEnd] => 1
                                            [pos] => PRP
                                            [ner] => O
                                            [before] => 
                                            [after] =>  
                                        )

                                    [1] => Array
                                        (
                                            [index] => 2
                                            [word] => will
                                            [originalText] => will
                                            [lemma] => will
                                            [characterOffsetBegin] => 2
                                            [characterOffsetEnd] => 6
                                            [pos] => MD
                                            [ner] => O
                                            [before] =>  
                                            [after] =>  
                                        )

                                    [2] => Array
                                        (
                                            [index] => 3
                                            [word] => meet
                                            [originalText] => meet
                                            [lemma] => meet
                                            [characterOffsetBegin] => 7
                                            [characterOffsetEnd] => 11
                                            [pos] => VB
                                            [ner] => O
                                            [before] =>  
                                            [after] =>  
                                        )

                                    [3] => Array
                                        (
                                            [index] => 4
                                            [word] => Mary
                                            [originalText] => Mary
                                            [lemma] => Mary
                                            [characterOffsetBegin] => 12
                                            [characterOffsetEnd] => 16
                                            [pos] => NNP
                                            [ner] => PERSON
                                            [before] =>  
                                            [after] =>  
                                        )

                                    [4] => Array
                                        (
                                            [index] => 5
                                            [word] => in
                                            [originalText] => in
                                            [lemma] => in
                                            [characterOffsetBegin] => 17
                                            [characterOffsetEnd] => 19
                                            [pos] => IN
                                            [ner] => O
                                            [before] =>  
                                            [after] =>  
                                        )

                                    [5] => Array
                                        (
                                            [index] => 6
                                            [word] => New
                                            [originalText] => New
                                            [lemma] => New
                                            [characterOffsetBegin] => 20
                                            [characterOffsetEnd] => 23
                                            [pos] => NNP
                                            [ner] => LOCATION
                                            [before] =>  
                                            [after] =>  
                                        )

                                    [6] => Array
                                        (
                                            [index] => 7
                                            [word] => York
                                            [originalText] => York
                                            [lemma] => York
                                            [characterOffsetBegin] => 24
                                            [characterOffsetEnd] => 28
                                            [pos] => NNP
                                            [ner] => LOCATION
                                            [before] =>  
                                            [after] =>  
                                        )

                                    [7] => Array
                                        (
                                            [index] => 8
                                            [word] => at
                                            [originalText] => at
                                            [lemma] => at
                                            [characterOffsetBegin] => 29
                                            [characterOffsetEnd] => 31
                                            [pos] => IN
                                            [ner] => O
                                            [before] =>  
                                            [after] =>  
                                        )

                                    [8] => Array
                                        (
                                            [index] => 9
                                            [word] => 10pm
                                            [originalText] => 10pm
                                            [lemma] => 10pm
                                            [characterOffsetBegin] => 32
                                            [characterOffsetEnd] => 36
                                            [pos] => CD
                                            [ner] => TIME
                                            [normalizedNER] => T22:00
                                            [before] =>  
                                            [after] => 
                                            [timex] => Array
                                                (
                                                    [tid] => t1
                                                    [type] => TIME
                                                    [value] => T22:00
                                                )

                                        )

                                )

                        )

                )

        )

Any questions?

Please let me know.

Credits

Some functions are forked from this "Stanford parser" package:

 https://github.com/agentile/PHP-Stanford-NLP


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