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SolrQuery::getHighlightMaxAlternateFieldLength() method in PHP is used to specify the maximum number of characters to consider when generating alternate field highlights.

The getHighlightMaxAlternateFieldLength() method is typically used when highlighting multiple fields in a Solr query. It defines the maximum number of characters to consider from other fields as an alternate source of highlighting text when the primary field does not have enough suitable text to generate a relevant highlight.

For example, let's say you have two fields, "title" and "description", and you want to highlight both in your search results. If the "title" field doesn't have enough text to generate a meaningful highlight, the getHighlightMaxAlternateFieldLength() method allows you to specify the maximum number of characters to consider from the "description" field as an alternate source.

Here's an example usage in PHP:

php
$query = new SolrQuery();
$query->setHighlight(true);
$query->setHighlightFields("title,description");
$query->setHighlightMaxAlternateFieldLength(100); // Set the maximum number of characters from alternate fields

// ...

// Execute the query and get the results
$results = $client->query($query)->getResponse();


In this example, we set the highlight to be enabled and specify the fields to be highlighted ("title" and "description"). We also set the maximum number of characters from alternate fields to be considered as 100 characters.

By using the getHighlightMaxAlternateFieldLength() method, you can control the behavior of Solr highlighting and ensure that your search results contain relevant and meaningful highlights even when the primary field doesn't have enough suitable text.