PDO::FETCH_KEY_GROUP

gistfile1.php

PDO::FETCH_ASSOC

array(2) {
  [0]=>
  array(3) {
    ["id"]=>
    int(1)
    ["name"]=>
    string(7) "English"
    ["code"]=>
    string(3) "eng"
  }
  [1]=>
  array(3) {
    ["id"]=>
    int(2)
    ["name"]=>
    string(9) "Français"
    ["code"]=>
    string(3) "fre"
  }
}

PDO::FETCH_KEY_GROUP

array(2) {
  [1]=>
  array(3) {
    ["id"]=>
    int(1)
    ["name"]=>
    string(7) "English"
    ["code"]=>
    string(3) "eng"
  }
  [2]=>
  array(3) {
    ["id"]=>
    int(2)
    ["name"]=>
    string(9) "Français"
    ["code"]=>
    string(3) "fre"
  }
}

Implementation:

public function fetchAll ($how = null, $fetch_argument = null, $ctor_args = null) {
  if ($how === PDO::FETCH_KEY_GROUP) {
    	$result = parent::fetchAll(PDO::FETCH_ASSOC);
    	return array_combine(array_map('array_shift', $result), $result);
	} else {
    	return parent::fetchAll($how, $fetch_argument, $ctor_args);
	}
}