Using Elasticsearch for geographical location search in PHP

Using Elasticsearch in PHP for geographical location search

Abstract: This article will introduce how to use PHP and Elasticsearch to implement the geographical location search function. We'll walk through how to configure Elasticsearch, how to index geolocation data, how to perform geolocation searches, and provide corresponding PHP code examples.

1. Preparation

Before we begin, we need to ensure that PHP and Elasticsearch have been installed and configured. This can be done by following these steps:

1. Download and install PHP: Visit [https://www.php.net/downloads.php](https://www.php.net/downloads. php) and follow the instructions to install the version suitable for your operating system.
2. Download and install Elasticsearch: Visit [https://www.elastic.co/downloads/elasticsearch](https://www.elastic.co/downloads/elasticsearch) to download and install the corresponding version according to the instructions .

2. Configure Elasticsearch

2.1 Start the Elasticsearch service:

Enter the following command on the command line to start the Elasticsearch service:

elasticsearch

2.2 Create an index ：

Enter the following command on the command line to create an index named "locations":

curl -XPUT 'http://localhost:9200/locations'

3. Index geographical location data

3.1 Create geographical location mapping:

Create a map named "location" containing longitude and latitude information. Enter the following command at the command line:

curl -XPUT 'http://localhost:9200/locations/_mapping' -H 'Content-Type: application/json' -d '
{
  "properties": {
    "location": {
      "type": "geo_point"
    }
  }
}'

3.2 Index geographic location data:

Create a document using the following sample data and index it into the "locations" index:

<?php

require 'vendor/autoload.php';

use ElasticsearchClientBuilder;

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

$params = [
    'index' => 'locations',
    'type' => 'location',
    'id' => '1',
    'body' => [
        'location' => [
            'lat' => 37.7749,
            'lon' => -122.4194
        ]
    ]
];

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

print_r($response);

4. Perform a geolocation search

4.1 Create a geolocation search query:

Use the following sample code to create a geolocation search query:

<?php

require 'vendor/autoload.php';

use ElasticsearchClientBuilder;

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

$params = [
    'index' => 'locations',
    'type' => 'location',
    'body' => [
        'query' => [
            'bool' => [
                'must' => [
                    'match_all' => (object) []
                ],
                'filter' => [
                    'geo_distance' => [
                        'distance' => '100km',
                        'location' => [
                            'lat' => 37.7749,
                            'lon' => -122.4194
                        ]
                    ]
                ]
            ]
        ]
    ]
];

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

print_r($response);

In the above example, We used the "geo_distance" filter to perform geographic location searches, set the search radius to 100km, and specified the latitude and longitude of the center location.

4.2 Get search results:

Get the matching document list based on the "hits" field in the search results:

<?php

// ...

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

The above code will print out the matching document list of the search results .

Conclusion

Through the above steps, we have successfully configured Elasticsearch, indexed geographical location data, and implemented the geographical location search function. The code can be further expanded and optimized according to actual needs to meet more complex query needs.

Reference materials:

• Elasticsearch official documentation: [https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html](https: //www.elastic.co/guide/en/elasticsearch/reference/current/index.html)
• Elasticsearch PHP client documentation: [https://www.elastic.co/guide/en/elasticsearch /client/php-api/current/index.html](https://www.elastic.co/guide/en/elasticsearch/client/php-api/current/index.html)

The above is the detailed content of Using Elasticsearch for geographical location search in PHP. For more information, please follow other related articles on the PHP Chinese website!