PHP输出的奇怪有关问题阿!求大神帮忙看看小弟我看了一天没看懂哪里来的奇怪字符

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Release: 2016-06-13 12:08:44
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PHP输出的奇怪问题阿!!!求大神帮忙看看我看了一天没看懂哪里来的奇怪字符
首先我刚开始学php  写了个从数据库读完后 输出JSON的过程

看上去结果是对的阿~~~ 然后我去某效验网站   提示我 
于是我找了半天原因发现不知道哪里来的阿  在字符串前面有4个莫名其妙的东西。。。

请问这个是哪里来的阿 = = 我要怎么弄掉。。。
function index()
{
$cc=new DemoDao();
$resu=$cc->index();
$json=json_encode($resu);
$json=urldecode($json);
$total=24;
$json="{".'"total"'.":$total,".'"rows"'.":".$json."}";
echo $json;
}
最后输出Json的

急求大神 帮我看看~!!!!!!!!!!!!   编码都是utf-8
------解决思路----------------------
显然是bom头

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