src/Query/Parser.php
public static function find($id = null, $connection)
    {
        if (gettype($id)!="string" && !is_numeric($id)) {
            throw new ClusterpointException("\"->find()\" function: \"_id\" is not in valid format.", 9002);
        }
        $connection->method = 'GET';
        $connection->action = '['.urlencode($id).']';
        $connection->multiple = false;
        return self::sendQuery($connection);
    }
public static function find($id = null, $connection)
    {
        if (gettype($id)!="string" && !is_numeric($id)) {
            throw new ClusterpointException("\"->find()\" function: \"_id\" is not in valid format.", 9002);
        }
        $connection->method = 'GET';
        $connection->action = '['.urlencode($id).']';
        $connection->multiple = false;
        return self::sendQuery($connection);
    }
Set query parametrs to execute - retrieve by "_id".

@param  string  $id
@param  \stdClass  $connection
@return \Clusterpoint\Response\Single