(PECL solr >= 0.9.2)
SolrParams::toString — Returns all the name-value pair parameters in the object
final public SolrParams::toString ([ bool $url_encode = false ] ) : string
Returns all the name-value pair parameters in the object
url_encode
Whether to return URL-encoded values
Returns a string on success and false on failure.
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https://www.php.net/manual/en/solrparams.tostring.php