$a = array(1,2,3);
$b = array(1,2,3);
$c = array(1,2,3);
$arr = array($a, $b, $c);
echo json_encode($arr);
$brr = array('a'=>$a, 'b'=>$b, 'c'=>$c);
echo "\n";
echo json_encode($brr);
$crr = array(123=>$a, 234=>$b, 254=>$c);
echo "\n";
echo json_encode($crr);

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