Doctrine - How to bind array to the SQL?

You can't use prepared statements with arrays simply because sql itself does not support arrays. Which is a real shame. Somewhere along the line you actually need to determine if your data contains say three items and emit a IN (?,?,?). The Doctrine ORM entity manager does this for you automatically.

Fortunately, the DBAL has you covered. You just don't use bind or prepare. The manual has an example: https://www.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/data-retrieval-and-manipulation.html#list-of-parameters-conversion

In your case it would look something like:

$sql = "select * from user where id in (?) and status = ?";
$values = [$accounts,'declined'];
$types = [Connection::PARAM_INT_ARRAY, \PDO::PARAM_STR];
$stmt = $conn->executeQuery($sql,$values,$types);
$result = $stmt->fetchAll();

The above code is untested but you should get the idea. (Make sure you use Doctrine\DBAL\Connection; for Connection::PARAM_INT_ARRAY)

Note for people using named parameters:

If you are using named parameters (:param instead of ?), you should respect the parameter names when providing types. For example:

$sql = "select * from user where id in (:accounts) and status = :status";
$values = ['accounts' => $accounts, 'status' => 'declined'];
$types = ['accounts' => Connection::PARAM_INT_ARRAY, 'status' => \PDO::PARAM_STR];

If you want to stick to the :param syntax where order does not matter, you have to do a bit of extra work, but I'll show you an easier way to bind the parameters:

// store all your parameters in one array
$params = array(
    ':status' => 'declined'
);

// then, using your arbitrary array of id's ...
$array_of_ids = array(5, 6, 12, 14);

// ... we're going to build an array of corresponding parameter names
$id_params = array();
foreach ($array_of_ids as $i => $id) {
    // generate a unique name for this parameter
    $name = ":id_$i"; // ":id_0", ":id_1", etc.

    // set the value
    $params[$name] = $id;

    // and keep track of the name
    $id_params[] = $name;
}

// next prepare the parameter names for placement in the query string
$id_params = implode(',', $id_params); // ":id_0,:id_1,..."
$sql = "select * from user where id in ($id_params) and status = :status";

In this case we end up with: "select * from user where id in (:id_0,:id_1,:id_2,:id_3) and status = :status"

// now prepare your statement like before...
$stmt = $em->getConnection()->prepare($sql);

// ...bind all the params in one go...
$stmt->execute($params);

// ...and get your results!
$result = $stmt->fetchAll();

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This approach will also work with an array of strings.