これと同様のデータ、変数 nId がある場合、それを走査した後にその名前を知るにはどうすればよいでしょうか?

$s =<<< TXT<br />
[ {<br />
  "Id" : "t1sd",<br />
  "Name" : "xiaoxiao",<br />
  "Namea" : "测试样子",<br />
  "nId" : "csd2"<br />
}, {<br />
  "Id" : "ae2",<br />
  "Name" : "张三",<br />
  "Namea" : "哈哈",<br />
  "nId" : "20af"<br />
}, {<br />
  "Id" : "c3P",<br />
  "Name" : "用户1",<br />
  "Namea" : "dingding",<br />
  "nId" : "4fc"<br />
} ]<br />
TXT;<br />
$nId = '4fc';<br />
$t = json_decode($s, true);<br />
$r = array_filter($t, function($a)use($nId) { return $a['nId'] == $nId; });<br />
echo current($r)['Name'];<br />