Cache::getIdentifier() 

\nn\t3::Cache()->getIdentifier($identifier = NULL); 

Converts transferred cache identifiers into a usable string. Can also process an array as identifier.

@param mixed $indentifier
@return string

Source Code 

public static function getIdentifier( $identifier = null )
{
	if (is_array($identifier)) {
		$identifier = json_encode($identifier);
	}
	return md5($identifier);
}
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