Is there a way to fetch associative array grouped by the values of a specified column with PDO?

It's quite old topic, but I found very easy solution:

->fetchAll(\PDO::FETCH_GROUP|\PDO::FETCH_UNIQUE)

First col will be set as key, rest will be set as value.

No need to walk over the array or use array_map.

to reduce a unnecessary nesting array level:

$res = $pdo->query('SELECT * FROM employee')->fetchAll(PDO::FETCH_GROUP|PDO::FETCH_ASSOC);
$res = array_map('reset', $res);

PDO::FETCH_GROUP|PDO::FETCH_UNIQUE|PDO::FETCH_ASSOC

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