https://www.php.net/manual/zh/solrinputdocument.getfield.php
PHP: SolrInputDocument::getField - Manual
Retrieves a field by name
phpgetfieldmanual
https://www.php.net/manual/de/solrdocument.getfield.php
PHP: SolrDocument::getField - Manual
Retrieves a field by name
phpsolrdocumentgetfieldmanual