How to use php Elasticsearch to implement multi-field combined query?

How to use php Elasticsearch to implement multi-field combination query?

Introduction:
Elasticsearch is a distributed open source search engine based on Lucene. It provides fast and reliable full-text search capabilities and supports the storage, retrieval and analysis of large-scale data. In this article, we will explore how to use the php Elasticsearch library to implement multi-field combined queries to better meet various search needs.

1. Install and configure Elasticsearch
To use the php Elasticsearch library, you first need to install and configure Elasticsearch. You can download and install Elasticsearch on the official website and make sure it is running.

2. Install the php Elasticsearch library
You can use Composer to install the php Elasticsearch library. Create a composer.json file in the project root directory and add the following content:

{
"require": {

"elasticsearch/elasticsearch": "^7.0"

}
}
Then in the command Execute the following command in the line to install the library:
composer install

3. Connect to Elasticsearch
Next, create a client in the php code to connect to Elasticsearch. Add the following code at the beginning of the file:

require 'vendor/autoload.php';

$client = new ElasticsearchClient();

4. Create an index
Store the data to be searched in the index. Let's assume here that we want to store some book information. Add the following snippet to the php code:

$params = [

'index' => 'books',
'body' => [
    'mappings' => [
        'properties' => [
            'title' => [
                'type' => 'text'
            ],
            'author' => [
                'type' => 'text'
            ],
            'category' => [
                'type' => 'keyword'
            ]
        ]
    ]
]

];

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

This will create an index named "books" and define three fields: "title", "author" and "category".

5. Add documents
Add documents to be searched to the index. Add the following snippet to your php code:

$params = [

'index' => 'books',
'id' => '1',
'body' => [
    'title' => 'The Great Gatsby',
    'author' => 'F. Scott Fitzgerald',
    'category' => 'Fiction'
]

];

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

6. Execute multi-field combination query
Now we are ready to execute multi-field combination query. Add the following snippet to your php code:

$params = [

'index' => 'books',
'body' => [
    'query' => [
        'bool' => [
            'must' => [
                ['match' => ['title' => 'great']],
                ['match' => ['author' => 'fitzgerald']]
            ]
        ]
    ]
]

];

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

In the above code, we use bool query to represent multi-field combination query. In the must clause, we use two match clauses to match the "title" field and the "author" field respectively. This means that only documents that meet both conditions will be retrieved.

7. Processing search results
The search results will include all documents that meet the query conditions. Add the following snippet in your php code to handle the search results:

foreach ($response['hits']['hits'] as $hit) {

echo $hit['_source']['title'];
echo $hit['_source']['author'];
echo $hit['_source']['category'];
echo "

";
}

8. Summary
In this article, we introduced how to use the php Elasticsearch library to implement multi-field combined queries. We discussed installing and configuring Elasticsearch, installing the php Elasticsearch library, connecting to Elasticsearch, and creating indexes , add documents, and perform multi-field combination queries. By using the php Elasticsearch library, we can easily manipulate Elasticsearch and meet various search needs.

Code sample overview.PNG
The above is how to use php Detailed steps and sample code for implementing multi-field combination query in Elasticsearch. I hope it will be helpful to you.

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