php pdo: get the columns name of a table

Question

How can I get all the column names from a table using PDO?

id         name        age
1          Alan        35      
2          Alex        52
3          Amy         15

The info that I want to get are,

id         name        age

EDIT:

Here is my attempt,

$db = $connection->get_connection();
$select = $db->query('SELECT * FROM contacts');

$total_column = $select->columnCount();
var_dump($total_column);

for ($counter = 0; $counter < $total_column; $counter ++) {
    $meta = $select->getColumnMeta($counter);
    $column[] = $meta['name'];
}
print_r($column);

Then I get,

Array
(
    [0] => id
    [1] => name
    [2] => age
    ...

)

Answer 1

I solve the problem the following way (MySQL only)

$q = $dbh->prepare("DESCRIBE tablename");
$q->execute();
$table_fields = $q->fetchAll(PDO::FETCH_COLUMN);