Elastica: A PHP Client for Elasticsearch

Elastica: elasticsearch PHP Client

All documentation for Elastica can be found under Elastica.io. If you have questions, don't hesitate to ask them on Stack Overflow and add the Tag "Elastica" or in our Gitter channel. All library issues should go to the issue tracker from GitHub.

Compatibility

This release is compatible with all Elasticsearch 7.0 releases and onwards.

The testsuite is run against the most recent minor version of Elasticsearch, currently 7.14.1.

Contributing

Contributions are always welcome. For details on how to contribute, check the CONTRIBUTING file.

Versions & Dependencies

This project tries to follow Elasticsearch in terms of End of Life and maintenance since 5.x. It is generally recommended to use the latest point release of the relevant branch.

Elastica branch	ElasticSearch	elasticsearch-php	PHP
7.x	7.x	^7.0	^7.2 || ^8.0
6.x	6.x	^6.0	^7.0 || ^8.0

Unmaintained versions:

Elastica version	ElasticSearch	elasticsearch-php	PHP
5.x	5.x	^5.0	>=5.6
3.x	2.4.0	no	>=5.4
2.x	1.7.2	no	>=5.3.3

---

Download Details:

Author: ruflin
Source Code: https://github.com/ruflin/Elastica 
License: MIT license

#php #elasticsearch #hacktoberfest 

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Elasticsearch-php: Official PHP Client for Elasticsearch

Elasticsearch PHP client 

This is the official PHP client for Elasticsearch.

---

Getting started 🐣

Using this client assumes that you have an Elasticsearch server installed and running.

You can install the client in your PHP project using composer:

composer require elasticsearch/elasticsearch

After the installation you can connect to Elasticsearch using the ClientBuilder class. For instance, if your Elasticsearch is running on localhost:9200 you can use the following code:

use Elastic\Elasticsearch\ClientBuilder;

$client = ClientBuilder::create()
    ->setHosts(['localhost:9200'])
    ->build();

// Info API
$response = $client->info();

echo $response['version']['number']; // 8.0.0

The $response is an object of Elastic\Elasticsearch\Response\Elasticsearch class that implements ElasticsearchInterface, PSR-7 ResponseInterface and ArrayAccess.

This means the $response is a PSR-7 object:

echo $response->getStatusCode(); // 200
echo (string) $response->getBody(); // Response body in JSON

and also an "array", meaning you can access the response body as an associative array, as follows:

echo $response['version']['number']; // 8.0.0

var_dump($response->asArray());  // response body content as array

Moreover, you can access the response body as object, string or bool:

echo $response->version->number; // 8.0.0

var_dump($response->asObject()); // response body content as object
var_dump($response->asString()); // response body as string (JSON)
var_dump($response->asBool());   // true if HTTP response code between 200 and 300

Configuration

Elasticsearch 8.0 offers security by default, that means it uses TLS for protect the communication between client and server.

In order to configure elasticsearch-php for connecting to Elasticsearch 8.0 we need to have the certificate authority file (CA).

You can install Elasticsearch in different ways, for instance using Docker you need to execute the followind command:

docker pull docker.elastic.co/elasticsearch/elasticsearch:8.0.1

Once you have the docker image installed, you can execute Elasticsearch, for instance using a single-node cluster configuration, as follows:

docker network create elastic
docker run --name es01 --net elastic -p 9200:9200 -p 9300:9300 -it docker.elastic.co/elasticsearch/elasticsearch:8.0.1

This command creates an elastic Docker network and start Elasticsearch using the port 9200 (default).

When you run the docker image a password is generated for the elastic user and it's printed to the terminal (you might need to scroll back a bit in the terminal to view it). You have to copy it since we will need to connect to Elasticsearch.

Now that Elasticsearch is running we can get the http_ca.crt file certificate. We need to copy it from the docker instance, using the following command:

docker cp es01:/usr/share/elasticsearch/config/certs/http_ca.crt .

Once we have the http_ca.crt certificate and the password, copied during the start of Elasticsearch, we can use it to connect with elasticsearch-php as follows:

$client = ClientBuilder::create()
    ->setHosts(['https://localhost:9200'])
    ->setBasicAuthentication('elastic', 'password copied during Elasticsearch start')
    ->setCABundle('path/to/http_ca.crt')
    ->build();

For more information about the Docker configuration of Elasticsearch you can read the official documentation here.

Use Elastic Cloud

You can use Elastic Cloud as server with elasticsearch-php. Elastic Cloud is the PaaS solution offered by Elastic.

For connecting to Elastic Cloud you just need the Cloud ID and the API key.

You can get the Cloud ID from the My deployment page of your dashboard (see the red rectangle reported in the screenshot).

You can generate an API key in the Management page under the section Security.

When you click on Create API key button you can choose a name and set the other options (for example, restrict privileges, expire after time, and so on).

After this step you will get the API keyin the API keys page.

IMPORTANT: you need to copy and store the API keyin a secure place, since you will not be able to view it again in Elastic Cloud.

Once you have collected the Cloud ID and the API key, you can use elasticsearch-php to connect to your Elastic Cloud instance, as follows:

$client = ClientBuilder::create()
    ->setElasticCloudId('insert here the Cloud ID')
    ->setApiKey('insert here the API key')
    ->build();

Usage

The elasticsearch-php client offers 400+ endpoints for interacting with Elasticsearch. A list of all these endpoints is available in the official documentation of Elasticsearch APIs.

Here we reported the basic operation that you can perform with the client: index, search and delete.

Index a document

You can store (index) a JSON document in Elasticsearch using the following code:

use Elastic\Elasticsearch\Exception\ClientResponseException;
use Elastic\Elasticsearch\Exception\ServerResponseException;

$params = [
    'index' => 'my_index',
    'body'  => [ 'testField' => 'abc']
];

try {
  $response = $client->index($params);
} catch (ClientResponseException $e) {
  // manage the 4xx error
} catch (ServerResponseException $e) {
  // manage the 5xx error
} catch (Exception $e) {
  // eg. network error like NoNodeAvailableException
}

print_r($response->asArray());  // response body content as array

Elasticsearch stores the {"testField":"abc"} JSON document in the my_index index. The ID of the document is created automatically by Elasticsearch and stored in $response['_id'] field value. If you want to specify an ID for the document you need to store it in $params['id'].

You can manage errors using ClientResponseException and ServerResponseException. The PSR-7 response is available using $e->getResponse() and the HTTP status code is available using $e->getCode().

Search a document

Elasticsearch provides many different way to search documents. The simplest search that you can perform is a match query, as follows:

$params = [
    'index' => 'my_index',
    'body'  => [
        'query' => [
            'match' => [
                'testField' => 'abc'
            ]
        ]
    ]
];
$response = $client->search($params);

printf("Total docs: %d\n", $response['hits']['total']['value']);
printf("Max score : %.4f\n", $response['hits']['max_score']);
printf("Took      : %d ms\n", $response['took']);

print_r($response['hits']['hits']); // documents

Using Elasticsearch you can perform different query search, for more information we suggest toread the official documention reported here.

Delete a document

You can delete a document specifing the index name and the ID of the document, as follows:

use Elastic\Elasticsearch\Exception\ClientResponseException;

try {
    $response = $client->delete([
        'index' => 'my_index',
        'id' => 'my_id'
    ]);
} catch (ClientResponseException $e) {
    if ($e->getCode() === 404) {
        // the document does not exist
    }
}
if ($response['acknowledge'] === 1) {
    // the document has been delete
}

For more information about the Elasticsearch REST API you can read the official documentation here.

Versioning

This client is versioned and released alongside Elasticsearch server.

To guarantee compatibility, use the most recent version of this library within the major version of the corresponding Enterprise Search implementation.

For example, for Elasticsearch 7.16, use 7.16 of this library or above, but not 8.0.

Backward Incompatible Changes :boom:

The 8.0.0 version of elasticsearch-php contains a new implementation compared with 7.x. It supports PSR-7 for HTTP messages and PSR-18 for HTTP client communications.

We tried to reduce the BC breaks as much as possible with 7.x but there are some (big) differences:

• we changed the namespace, now everything is under Elastic\Elasticsearch
• we used the elastic-transport-php library for HTTP communications;
• we changed the Exception model, using the namespace Elastic\Elasticsearch\Exception. All the exceptions extends the ElasticsearchException interface, as in 7.x
• we changed the response type of each endpoints using an Elasticsearch response class. This class wraps a a PSR-7 response allowing the access of the body response as array or object. This means you can access the API response as in 7.x, no BC break here! :angel:
• we changed the ConnectionPool in NodePool. The connection naming was ambigous since the objects are nodes (hosts)

You can have a look at the BREAKING_CHANGES file for more information.

Mock the Elasticsearch client

If you need to mock the Elasticsearch client you just need to mock a PSR-18 HTTP Client.

For instance, you can use the php-http/mock-client as follows:

use Elastic\Elasticsearch\ClientBuilder;
use Elastic\Elasticsearch\Response\Elasticsearch;
use Http\Mock\Client;
use Nyholm\Psr7\Response;

$mock = new Client(); // This is the mock client

$client = ClientBuilder::create()
    ->setHttpClient($mock)
    ->build();

// This is a PSR-7 response
$response = new Response(
    200, 
    [Elasticsearch::HEADER_CHECK => Elasticsearch::PRODUCT_NAME],
    'This is the body!'
);
$mock->addResponse($response);

$result = $client->info(); // Just calling an Elasticsearch endpoint

echo $result->asString(); // This is the body!

We are using the ClientBuilder::setHttpClient() to set the mock client. You can specify the response that you want to have using the addResponse($response) function. As you can see the $response is a PSR-7 response object. In this example we used the Nyholm\Psr7\Response object from the nyholm/psr7 project. If you are using PHPUnit you can even mock the ResponseInterface as follows:

$response = $this->createMock('Psr\Http\Message\ResponseInterface');

Notice: we added a special header in the HTTP response. This is the product check header, and it is required for guarantee that elasticsearch-php is communicating with an Elasticsearch server 8.0+.

For more information you can read the Mock client section of PHP-HTTP documentation.

FAQ 🔮

Where do I report issues with the client?

If something is not working as expected, please open an issue.

Where else can I go to get help?

You can checkout the Elastic community discuss forums.

Contribute 🚀

We welcome contributors to the project. Before you begin, some useful info...

• If you want to contribute to this project you need to subscribe to a Contributor Agreement.
• Before opening a pull request, please create an issue to discuss the scope of your proposal.
• If you want to send a PR for version 8.0 please use the 8.0 branch, for 8.1 use the 8.1 branch and so on.
• Never send PR to master unless you want to contribute to the development version of the client (master represents the next major version).
• Each PR should include a unit test using PHPUnit. If you are not familiar with PHPUnit you can have a look at the reference.

Thanks in advance for your contribution! :heart:

Download Details:

Author: Elastic
Source Code: https://github.com/elastic/elasticsearch-php 
License: MIT license

#php #elasticsearch #client 

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Official PHP low-level client for Elasticsearch

elasticsearch-php

Official low-level client for Elasticsearch. Its goal is to provide common ground for all Elasticsearch-related code in PHP; because of this it tries to be opinion-free and very extendable.

To maintain consistency across all the low-level clients (Ruby, Python, etc.), clients accept simple associative arrays as parameters. All parameters, from the URI to the document body, are defined in the associative array.

Starting from version 7.4.0, all the endpoints (and namespaces) are autogenerated using the util/GenerateEndpoints.php script. This script reads the Elasticsearch API specs and generates the PHP classes for all the endpoints.

Starting from version 7.7.0 we included also the XPack endpoints of Elasticsearch. These APIs are related to:

• Cross-cluster replication
• Graph explorer
• Info
• Licensing
• Machine learning anomaly detection
• Machine learning data frame analytics
• Migration
• Reload search analyzers
• Rollup
• Security
• Snapshot lifecycle management
• Transform
• Usage
• Watcher

Table of Contents

• elasticsearch-php
  • Features
  • Version Matrix
  • Compatibility
  • Documentation
  • Installation via Composer
  • PHP Version Requirement
  • Quickstart
    • Index a document
    • Get a document
    • Search for a document
    • Delete a document
    • Delete an index
    • Create an index
• Unit Testing using Mock a Elastic Client
• Contributing
• Wrap up
  • Available Licenses
    • Contributions

Features

• One-to-one mapping with REST API and other language clients
• Configurable, automatic discovery of cluster nodes
• Persistent, Keep-Alive connections (within the lifetime of the script)
• Load balancing (with pluggable selection strategy) across all available nodes. Defaults to round-robin
• Pluggable connection pools to offer different connection strategies
• Generalized, pluggable architecture - most components can be replaced with your own custom class if specialized behavior is required
• Option to use asynchronous future, which enables parallel execution of curl requests to multiple nodes

Note: X-Pack endpoints are included from elasticsearch-php 7.7+.

Version Matrix

Elasticsearch Version	Elasticsearch-PHP Branch
>= 7.x	7.x
>= 6.6, < 7.0	6.7.x
>= 6.0, < 6.6	6.5.x
>= 5.0, < 6.0	5.0
>= 2.0, < 5.0	1.0 or 2.0
>= 1.0, < 2.0	1.0 or 2.0
<= 0.90.x	0.4

• If you are using Elasticsearch 7.x you can use Elasticsearch-PHP 7.x branch
• If you are using Elasticsearch 6.6 to 6.7, use Elasticsearch-PHP 6.7.x branch.
• If you are using Elasticsearch 6.0 to 6.5, use Elasticsearch-PHP 6.5.x branch.
• If you are using Elasticsearch 5.x, use Elasticsearch-PHP 5.0 branch.
• If you are using Elasticsearch 1.x or 2.x, prefer using the Elasticsearch-PHP 2.0 branch. The 1.0 branch is compatible however.
• If you are using a version older than 1.0, you must install the 0.4 Elasticsearch-PHP branch. Since ES 0.90.x and below is now EOL, the corresponding 0.4 branch will not receive any more development or bugfixes. Please upgrade.
• You should never use Elasticsearch-PHP Master branch, as it tracks Elasticsearch master and may contain incomplete features or breaks in backwards compatibility. Only use ES-PHP master if you are developing against ES master for some reason.

Compatibility

Language clients are forward compatible; meaning that clients support communicating with greater or equal minor versions of Elasticsearch. Elasticsearch language clients are only backwards compatible with default distributions and without guarantees made.

Documentation

Full documentation can be found here. Docs are stored within the repo under /docs/, so if you see a typo or problem, please submit a PR to fix it!

We also provide a code examples generator for PHP using the util/GenerateDocExamples.php script. This command parses the util/alternative_report.spec.json file produced from this JSON specification and it generates the PHP examples for each digest value. The examples are stored in asciidoc format under docs/examples folder.

Installation via Composer

The recommended method to install Elasticsearch-PHP is through Composer.

Add elasticsearch/elasticsearch as a dependency in your project's composer.json file (change version to suit your version of Elasticsearch, for instance for ES 7.0):

    {
        "require": {
            "elasticsearch/elasticsearch": "^7.0"
        }
    }

Download and install Composer:

    curl -s http://getcomposer.org/installer | php

Install your dependencies:

    php composer.phar install

Require Composer's autoloader

Composer also prepares an autoload file that's capable of autoloading all the classes in any of the libraries that it downloads. To use it, just add the following line to your code's bootstrap process:

    <?php

    use Elasticsearch\ClientBuilder;

    require 'vendor/autoload.php';

    $client = ClientBuilder::create()->build();

You can find out more on how to install Composer, configure autoloading, and other best-practices for defining dependencies at getcomposer.org.

PHP Version Requirement

Version 7.0 of this library requires at least PHP version 7.1. In addition, it requires the native JSON extension to be version 1.3.7 or higher.

Elasticsearch-PHP Branch	PHP Version
7.0	>= 7.1.0
6.0	>= 7.0.0
5.0	>= 5.6.6
2.0	>= 5.4.0
0.4, 1.0	>= 5.3.9

Quickstart

Index a document

In elasticsearch-php, almost everything is configured by associative arrays. The REST endpoint, document and optional parameters - everything is an associative array.

To index a document, we need to specify three pieces of information: index, id and a document body. This is done by constructing an associative array of key:value pairs. The request body is itself an associative array with key:value pairs corresponding to the data in your document:

$params = [
    'index' => 'my_index',
    'id'    => 'my_id',
    'body'  => ['testField' => 'abc']
];

$response = $client->index($params);
print_r($response);

The response that you get back indicates the document was created in the index that you specified. The response is an associative array containing a decoded version of the JSON that Elasticsearch returns:

Array
(
    [_index] => my_index
    [_type] => _doc
    [_id] => my_id
    [_version] => 1
    [result] => created
    [_shards] => Array
        (
            [total] => 1
            [successful] => 1
            [failed] => 0
        )

    [_seq_no] => 0
    [_primary_term] => 1
)

Get a document

Let's get the document that we just indexed. This will simply return the document:

$params = [
    'index' => 'my_index',
    'id'    => 'my_id'
];

$response = $client->get($params);
print_r($response);

The response contains some metadata (index, version, etc.) as well as a _source field, which is the original document that you sent to Elasticsearch.

Array
(
    [_index] => my_index
    [_type] => _doc
    [_id] => my_id
    [_version] => 1
    [_seq_no] => 0
    [_primary_term] => 1
    [found] => 1
    [_source] => Array
        (
            [testField] => abc
        )

)

If you want to retrieve the _source field directly, there is the getSource method:

$params = [
    'index' => 'my_index',
    'id'    => 'my_id'
];

$source = $client->getSource($params);
print_r($source);

The response will be just the _source value:

Array
(
    [testField] => abc
)

Search for a document

Searching is a hallmark of Elasticsearch, so let's perform a search. We are going to use the Match query as a demonstration:

$params = [
    'index' => 'my_index',
    'body'  => [
        'query' => [
            'match' => [
                'testField' => 'abc'
            ]
        ]
    ]
];

$response = $client->search($params);
print_r($response);

The response is a little different from the previous responses. We see some metadata (took, timed_out, etc.) and an array named hits. This represents your search results. Inside of hits is another array named hits, which contains individual search results:

Array
(
    [took] => 33
    [timed_out] =>
    [_shards] => Array
        (
            [total] => 1
            [successful] => 1
            [skipped] => 0
            [failed] => 0
        )

    [hits] => Array
        (
            [total] => Array
                (
                    [value] => 1
                    [relation] => eq
                )

            [max_score] => 0.2876821
            [hits] => Array
                (
                    [0] => Array
                        (
                            [_index] => my_index
                            [_type] => _doc
                            [_id] => my_id
                            [_score] => 0.2876821
                            [_source] => Array
                                (
                                    [testField] => abc
                                )

                        )

                )

        )

)

Delete a document

Alright, let's go ahead and delete the document that we added previously:

$params = [
    'index' => 'my_index',
    'id'    => 'my_id'
];

$response = $client->delete($params);
print_r($response);

You'll notice this is identical syntax to the get syntax. The only difference is the operation: delete instead of get. The response will confirm the document was deleted:

Array
(
    [_index] => my_index
    [_type] => _doc
    [_id] => my_id
    [_version] => 2
    [result] => deleted
    [_shards] => Array
        (
            [total] => 1
            [successful] => 1
            [failed] => 0
        )

    [_seq_no] => 1
    [_primary_term] => 1
)

Delete an index

Due to the dynamic nature of Elasticsearch, the first document we added automatically built an index with some default settings. Let's delete that index because we want to specify our own settings later:

$deleteParams = [
    'index' => 'my_index'
];
$response = $client->indices()->delete($deleteParams);
print_r($response);

The response:

Array
(
    [acknowledged] => 1
)

Create an index

Now that we are starting fresh (no data or index), let's add a new index with some custom settings:

$params = [
    'index' => 'my_index',
    'body'  => [
        'settings' => [
            'number_of_shards' => 2,
            'number_of_replicas' => 0
        ]
    ]
];

$response = $client->indices()->create($params);
print_r($response);

Elasticsearch will now create that index with your chosen settings, and return an acknowledgement:

Array
(
    [acknowledged] => 1
)

Unit Testing using Mock a Elastic Client

use GuzzleHttp\Ring\Client\MockHandler;
use Elasticsearch\ClientBuilder;

// The connection class requires 'body' to be a file stream handle
// Depending on what kind of request you do, you may need to set more values here
$handler = new MockHandler([
  'status' => 200,
  'transfer_stats' => [
     'total_time' => 100
  ],
  'body' => fopen('somefile.json'),
  'effective_url' => 'localhost'
]);
$builder = ClientBuilder::create();
$builder->setHosts(['somehost']);
$builder->setHandler($handler);
$client = $builder->build();
// Do a request and you'll get back the 'body' response above

Contributing

If you want to contribute to this project you need to subscribe to a Contributor Agreement. If you want to send a PR for version Y please use the Y.x branch. For instance if you want to send a PR for elasticsearch-php 7 use the 7.x branch.

Never send PR to master unless you want to contribute to the development version of the client (master represents the next major version).

Each PR should include a unit test using PHPUnit. If you are not familiar with PHPUnit you can have a look at this reference.

Wrap up

That was just a crash-course overview of the client and its syntax. If you are familiar with Elasticsearch, you'll notice that the methods are named just like REST endpoints.

You'll also notice that the client is configured in a manner that facilitates easy discovery via the IDE. All core actions are available under the $client object (indexing, searching, getting, etc.). Index and cluster management are located under the $client->indices() and $client->cluster() objects, respectively.

Check out the rest of the Documentation to see how the entire client works.

Available Licenses

Starting with version 1.3.1, Elasticsearch-PHP is available under two licenses: Apache v2.0 and LGPL v2.1. Versions prior to 1.3.1 are still licensed with only Apache v2.0.

The user may choose which license they wish to use. Since there is no discriminating executable or distribution bundle to differentiate licensing, the user should document their license choice externally, in case the library is re-distributed. If no explicit choice is made, assumption is that redistribution obeys rules of both licenses.

Contributions

All contributions to the library are to be so that they can be licensed under both licenses.

Apache v2.0 License:

Copyright 2013-2016 Elasticsearch

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

LGPL v2.1 Notice:

Copyright (C) 2013-2016 Elasticsearch

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Author: Elastic
Source Code: https://github.com/elastic/elasticsearch-php 
License: View license

#php #client #elasticsearch 

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