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SolrQuery::setMlt is a method in the PHP Solr extension that is used to set the parameters for the More Like This (MLT) feature in Solr.

The More Like This feature allows you to find documents in the Solr index that are similar to a given document based on its content. This can be useful for providing recommendations or finding related documents.

Here is an example of how you can use SolrQuery::setMlt:

php
$query = new SolrQuery();
$query->setMlt(true); // Enable More Like This
$query->setMltCount(10); // Set the number of similar documents to retrieve
$query->setMltFields('content'); // Set the fields to use for similarity comparison

// Set the document ID of the document you want to find similar documents for
$query->setMltDocument('doc1');

// Set any additional parameters as needed
$query->setMltMinTermFreq(2);
$query->setMltMinDocFreq(3);

// Execute the query and get the results
$result = $client->query($query);
$response = $result->getResponse();
$mltDocs = $response->getResponse()['moreLikeThis']['doc1'];

// Process the similar documents
foreach ($mltDocs as $mltDoc) {
// Do something with the similar document
echo $mltDoc['id'] . "\n";
}


In this example, the SolrQuery object is created and the setMlt method is called to enable the More Like This feature. The setMltCount method sets the number of similar documents to retrieve, and the setMltFields method specifies the fields to use for the similarity comparison.

The setMltDocument method is used to specify the document ID of the document you want to find similar documents for. Additional parameters such as setMltMinTermFreq and setMltMinDocFreq can be set to further customize the similarity comparison.

After executing the query and obtaining the response, the similar documents can be accessed from the 'moreLikeThis' section of the response using the document ID specified in setMltDocument. The example above simply echoes the IDs of the similar documents, but you can perform any desired processing on the similar documents.