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$a = array(
0 => array('name' => 1),
5 => array('name' => 2),
6 => array('name' => 3),
);
echo json_encode($a); //{"0":{"name":1},"5":{"name":2},"6":{"name":3}}
echo json_encode(array_values($a)); //[{"name":1},{"name":2},{"name":3}]