How to get a one-dimensional scalar array as a doctrine dql query result?
PHP < 5.5
You can use array_map
, and since you only have on item per array, you can elegantly use 'current'
as callback, instead of writing a closure.
$result = $em->createQuery("SELECT a.id FROM Auction a")->getScalarResult();$ids = array_map('current', $result);
See Petr Sobotka's answer below for additional info regarding memory usage.
PHP >= 5.5
As jcbwlkr's answered below, the recommended way it to use array_column
.
As of PHP 5.5 you can use array_column to solve this
$result = $em->createQuery("SELECT a.id FROM Auction a")->getScalarResult();$ids = array_column($result, "id");
A better solution is to use PDO:FETCH_COLUMN
. To do so you need a custom hydrator:
//MyProject/Hydrators/ColumnHydrator.phpnamespace DoctrineExtensions\Hydrators\Mysql;use Doctrine\ORM\Internal\Hydration\AbstractHydrator, PDO;class ColumnHydrator extends AbstractHydrator{ protected function hydrateAllData() { return $this->_stmt->fetchAll(PDO::FETCH_COLUMN); }}
Add it to Doctrine:
$em->getConfiguration()->addCustomHydrationMode('COLUMN_HYDRATOR', 'MyProject\Hydrators\ColumnHydrator');
And you can use it like this:
$em->createQuery("SELECT a.id FROM Auction a")->getResult("COLUMN_HYDRATOR");