(PECL solr >= 0.9.2)
SolrDocument::valid — Checks if the current position internally is still valid
public SolrDocument::valid ( ) : bool
Checks if the current position internally is still valid. It is used during foreach operations.
This function has no parameters.
Returns true on success and false if the current position is no longer valid.
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https://www.php.net/manual/en/solrdocument.valid.php