Returns a string representing the constructed collapse function

# SolrCollapseFunction::__toString

(PECL solr >= 2.2.0)

SolrCollapseFunction::__toString — Returns a string representing the constructed collapse function

### Beschreibung

public function SolrCollapseFunction::__toString(): string

Returns a string representing the constructed collapse function

### Parameter-Liste

Diese Funktion besitzt keine Parameter.

### Rückgabewerte

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