Returns a single field from the next record of a result set.
$index: The numeric index of the field to return. Defaults to the first field.
A single field from the next record, or FALSE if there is no next record.
Overrides StatementInterface::fetchField
public function fetchField($index = 0) {
// Call PDOStatement::fetchColumn to fetch the field.
return $this
->fetchColumn($index);
}