A fully featured full text search engine written in PHP
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README.md

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TNTSearch

TNTSearch is a fully featured full text search engine written entirely in PHP. It's simple configuration allows you to add an amazing search experience to your site in just minutes. It has also a build in geo-search and a text classifier. Other features are

  • fuzzy search
  • as you type functionality
  • geo-search
  • text-classification
  • stemming
  • custom tokenizers
  • bm25 ranking algorithm
  • boolean search
  • result highlighting

We created also some demo pages that show tolerant retrieval with n-grams in action. The package has bunch of helper functions like jaro-winkler and cosine similarity for distance calculations. It supports stemming for English, Croatian, Arabic, Italian, Russian, Portuguese and Ukrainian. If the built in stemmers aren't enough, the engine lets you easily plugin any compatible snowball stemmer. Some forks of the package even support Chinese.

Unlike many other engines, the index can be easily updated without doing a reindex or using deltas.

View online demo  |  Follow us on Twitter, or Facebook  |  Visit our sponsors:


Demo

Tutorials

Support us on Open Collective

Installation

The easiest way to install TNTSearch is via composer:

composer require teamtnt/tntsearch

Requirements

Before you proceed make sure your server meets the following requirements:

  • PHP >= 5.5
  • PDO PHP Extension
  • SQLite PHP Extension
  • mbstring PHP Extension

Examples

Creating an index

In order to be able to make full text search queries you have to create an index.

Usage:

use TeamTNT\TNTSearch\TNTSearch;

$tnt = new TNTSearch;

$tnt->loadConfig([
    'driver'    => 'mysql',
    'host'      => 'localhost',
    'database'  => 'dbname',
    'username'  => 'user',
    'password'  => 'pass',
    'storage'   => '/var/www/tntsearch/examples/'
]);

$indexer = $tnt->createIndex('name.index');
$indexer->query('SELECT id, article FROM articles;');
//$indexer->setLanguage('german');
$indexer->run();

Important: "storage" settings marks the folder where all of your indexes will be saved so make sure to have permission to write to this folder otherwise you might expect the following exception thrown:

  • [PDOException] SQLSTATE[HY000] [14] unable to open database file *

Note: If your primary key is different than id set it like:

$indexer->setPrimaryKey('article_id');

Making the primary key searchable

By default the primary key is not searchable, if you wanna make it searchable simply run:

$indexer->includePrimaryKey();

Searching

Searching for a phrase or keyword is trivial

use TeamTNT\TNTSearch\TNTSearch;

$tnt = new TNTSearch;

$tnt->loadConfig($config);
$tnt->selectIndex("name.index");

$res = $tnt->search("This is a test search", 12);

print_r($res); //returns an array of 12 document ids that best match your query

// to display the results you need an additional query against your application database
// SELECT * FROM articles WHERE id IN $res ORDER BY FIELD(id, $res);

The ORDER BY FIELD clause is important otherwise the database engine will not return the results in required order

Boolean Search

use TeamTNT\TNTSearch\TNTSearch;

$tnt = new TNTSearch;

$tnt->loadConfig($config);
$tnt->selectIndex("name.index");

//this will return all documents that have romeo in it but not juliet
$res = $tnt->searchBoolean("romeo -juliet");

//returns all documents that have romeo or hamlet in it
$res = $tnt->searchBoolean("romeo or hamlet");

//returns all documents that have either romeo AND juliet or prince AND hamlet
$res = $tnt->searchBoolean("(romeo juliet) or (prince hamlet)");

Fuzzy Search

The fuzziness can be tweaked by setting the following member variables:

public $fuzzy_prefix_length  = 2;
public $fuzzy_max_expansions = 50;
public $fuzzy_distance       = 2 //represents the levenshtein distance;
use TeamTNT\TNTSearch\TNTSearch;

$tnt = new TNTSearch;

$tnt->loadConfig($config);
$tnt->selectIndex("name.index");
$tnt->fuzziness = true;

//when the fuzziness flag is set to true the keyword juleit will return
//documents that match the word juliet, the default levenshtein distance is 2
$res = $tnt->search("juleit");

Updating the index

Once you created an index you don't need to reindex it each time you make some changes to your document collection. TNTSearch supports dynamic index updates.

use TeamTNT\TNTSearch\TNTSearch;

$tnt = new TNTSearch;

$tnt->loadConfig($config);
$tnt->selectIndex("name.index");

$index = $tnt->getIndex();

//to insert a new document to the index
$index->insert(['id' => '11', 'title' => 'new title', 'article' => 'new article']);

//to update an existing document
$index->update(11, ['id' => '11', 'title' => 'updated title', 'article' => 'updated article']);

//to delete the document from index
$index->delete(12);

Geo Search

Indexing

$candyShopIndexer = new TNTGeoIndexer;
$candyShopIndexer->loadConfig($config);
$candyShopIndexer->createIndex('candyShops.index');
$candyShopIndexer->query('SELECT id, longitude, latitude FROM candy_shops;');
$candyShopIndexer->run();

Searching

$currentLocation = [
    'longitude' => 11.576124,
    'latitude'  => 48.137154
];

$distance = 2; //km

$candyShopIndex = new TNTGeoSearch();
$candyShopIndex->loadConfig($config);
$candyShopIndex->selectIndex('candyShops.index');

$candyShops = $candyShopIndex->findNearest($currentLocation, $distance, 10);

Classification

use TeamTNT\TNTSearch\Classifier\TNTClassifier;

$classifier = new TNTClassifier();
$classifier->learn("A great game", "Sports");
$classifier->learn("The election was over", "Not sports");
$classifier->learn("Very clean match", "Sports");
$classifier->learn("A clean but forgettable game", "Sports");

$guess = $classifier->predict("It was a close election");
var_dump($guess['label']); //returns "Not sports"

Saving the classifier

$classifier->save('sports.cls');

Loading the classifier

$classifier = new TNTClassifier();
$classifier->load('sports.cls');

Drivers

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Backers

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Sponsors

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Credits

License

The MIT License (MIT). Please see License File for more information.


From Croatia with ♥ by TNT Studio (@tntstudiohr, blog)