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SolrQuery::setFacetDateHardEnd is a method in PHP Solr extension that is used to define a fixed ending date for a facet range query.

When using faceted search with Solr, you can create facet fields based on dates. The setFacetDateHardEnd method allows you to specify a fixed ending date for the facet date range.

For example, if you want to create a facet field based on the "timestamp" field in Solr, and you want the date range to be from January 1, 2020, to December 31, 2020, you can use the setFacetDateHardEnd method to set the end date as December 31, 2020.

Here is an example of how you can use setFacetDateHardEnd method in PHP:

php
$query->addFacetDateField('timestamp');
$query->setFacetDate('timestamp', '2020-01-01T00:00:00Z', '2020-12-31T23:59:59Z');
$query->setFacetDateHardEnd('timestamp', '2020-12-31T23:59:59Z');


In this example, we first add the facet date field 'timestamp' to the query. Then we set the start and end date for the facet date range using the setFacetDate method. Finally, we use the setFacetDateHardEnd method to specify that the end date is fixed and should not be adjusted according to the data in the index.

By using setFacetDateHardEnd, you ensure that the facet date range always ends at December 31, 2020, regardless of the data in the index.