PHP PDO return headers if there are no results

Is it possible to return the headers of a PDO query if there are no results as an array in PHP. For example:

SELECT 
    fruit.`type` AS 'Type', 
    fruit.`shape` AS 'Shape', 
    fruit.`age` AS 'Age', 
    fruit.`name` AS 'Name' 
    FROM fruit 
    WHERE name = :name;

$stmt = $this->db->prepare($sql);
$stmt->execute([
    'name' => 'chicken'
]);
return $stmt->fetchAll(PDO::FETCH_ASSOC);

Since the above will return no rows is it possible to instead return the SELECT AS so it will return:
['Type', 'Shape', 'Age', 'Name']

Answer

I’ve found a solution to this:

if ($stmt->rowCount() < 1) {
    $headers = [];
    foreach(range(0, $stmt->columnCount() - 1) as $index => $column_index)
    {
        $meta[] = $stmt->getColumnMeta($column_index);
        array_push($headers,$meta[$index]['name']);
    }
    return array_values($headers);
}