php json中文字符转义

 $test0=array(
    'id'=>100,
    'name'=>"demo数据",
    );

//将数组遍历，每个变量进行编码
 foreach($test0 as $key=>$val){
  $test[$key]=urlencode($val);
 }

 $test2=json_encode($test);
 $test3=urldecode($test2);
 echo $test3;