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For example, let's use some simple data set +---------+------+------+------------+ | name | age | sex | position | +---------+------+------+------------+ | Antony | 34 | M | programmer | | Sally | 30 | F | manager | | Matthew | 28 | M | designer | +---------+------+------+------------+ What we are trying to get is array organized this way Array ( [Antony] => Array ( [age] => 34 [sex] => M [position] => programmer ) [Sally] => Array ( [age] => 30 [sex] => F [position] => manager ) [Matthew] => Array ( [age] => 28 [sex] => M [position] => designer ) ) As a rough approximation we can use $pdo->query('SELECT * FROM employee')->fetchAll(PDO::FETCH_GROUP|PDO::FETCH_ASSOC); But as result we have unnecessary nesting level Array ( [Antony] => Array ( [0] => Array ( [age] => 34 [sex] => M [position] => programmer ) ) [Sally] => Array ( [0] => Array ( [age] => 30 [sex] => F [position] => manager ) ) [Matthew] => Array ( [0] => Array ( [age] => 28 [sex] => M [position] => designer ) ) ) I tried to get rid of this unnecessary nesting level by using callback function $stmt->fetchAll(PDO::FETCH_GROUP|PDO::FETCH_ASSOC|PDO::FETCH_FUNC, 'current'); But for some reasons It passes not Array ( [0] => Array (

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