php将json数据转成数组_php 把二维数组转为数组包含 json

public function jsontq(){
        $json = '[
  {
    "Domain": "cldw3.cn",
    "Domains": "cldw3.cn"
  },
  {
    "Domain": "cldw2.cn",
    "Domains": "cldw2.cn"
  },
  {
    "Domain": "cldw1.cn",
    "Domains": "cldw1.cn"
  },
  {
    "Domain": "cldw.cn",
    "Domains": "cldw.cn"
  }
]';
        $arr = json_decode($json,true);
        $urls = '';
        foreach ($arr as $v){
            $urls = $urls . '<br>' . $v['Domain'];
        }
        dump($arr);
        echo $urls;die;
    }
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输出