natsort()排列json数据时报错。解决方法

$json = '[{"name":"a1"},{"name":"a10"},{"name":"a12"},{"name":"a3"},{"name":"a5"},{"name":"b21"},{"name":"b2"},{"name":"b11"}]';
natsort($json);
$data = json_decode($json);
foreach ($data as $row) {
    echo $row->name.'
';//
}

$json = '[{"name":"a1"},{"name":"a10"},{"name":"a12"},{"name":"a3"},{"name":"a5"},{"name":"b21"},{"name":"b2"},{"name":"b11"}]';
$data = json_decode($json);
usort($data, 'cmp');
function cmp($a, $b) {
    if ($a->name == $b->name) return 0;
    return $a->name > $b->name ? 1 : -1;
}

foreach ($data as $row) {
    echo $row->name.'
';//
}