(PECL solr >= 0.9.2)
SolrDocument::fieldExists — Checks if a field exists in the document
public SolrDocument::fieldExists ( string $fieldName ) : bool
Checks if the requested field as a valid fieldname in the document.
fieldName
The name of the field.
Returns true if the field is present and false if it does not.
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https://www.php.net/manual/en/solrdocument.fieldexists.php