ReturnSource
Returns the next `Document` in the set, and advances the object's internal pointer. If the end of the set is reached, a new document will be fetched from the data source connection handle (`$_handle`). If no more records can be fetched, returns `null`.

Returns

mixed Returns the next record in the set, or `null`, if no more records are available.

Source

						public function next() {
		$prev = key($this->_data);
		$this->_valid = (next($this->_data) !== false);
		$cur = key($this->_data);

		if (isset($this->_removed[$cur])) {
			return $this->next();
		}
		if (!$this->_valid && $cur !== $prev && $cur !== null) {
			$this->_valid = true;
		}
		return $this->_valid ? $this->__get(key($this->_data)) : null;
	}