php一维数组改变元素或者新增元素

$json = \'{"name":"fdipzone","date":"2016-10-10"}\';
$data = json_decode($json, true);
$data[\'xxx\'] = \'abc\';//新增
$data[\'name\'] = \'abc\';//改变值
$data[\'date\'] = \'2017-10-10\';//改变值
$result = json_encode($data);
echo $result; // 修改后数据