(PECL solr >= 2.3.0)
SolrInputDocument::getChildDocuments — Returns an array of child documents (SolrInputDocument)
public SolrInputDocument::getChildDocuments ( ) : array
Returns an array of child documents (SolrInputDocument)
This function has no parameters.
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https://www.php.net/manual/en/solrinputdocument.getchilddocuments.php