POST variable in array's name php
$choice1 =
    array (
        'order' => array (1,2,3,4,5),
            'settings' => (1,0,1)
    );
$choice2 =
    array (
        'order' => array (1,5,3,2,4),
            'settings' => (0,0,0)
    );
if(isset($_POST['choice'])) {
    $template_to_get = $_POST['choice'];
    $order_display = $template_to_get['order'];          // Here is the problem
    echo json_encode(array('order' => $order_display));
}

$order_display = $$template_to_get['order'];
$order_display = "$".$template_to_get['order'];
...

$order_display = $choice1['order'];

$choices = array(
    1 => array(
        'order' => array (1,5,3,2,4),
        'settings' => (0,0,0),
    ),
    2 => array(
        'order' => array (1,2,3,4,5),
        'settings' => (1,0,1)
    ),
);

if(isset($_POST['choice'])) {
    $template_choice = $_POST['choice'];
    echo json_encode(array('order' => $choices[ $template_choice ]['order'] ));
}

$choices = array(
    'template_1' => array( ... );
    ...
);

$order_display = $choice1[$_POST['choice']];

foreach ($choice as $key => $val)
foreach ($val as $nval)
  echo $key . ' : ' . $nval . '<br />';

$varname = 'choice' . $_POST['choice'];
$order_display = $$varname['order'];