PHP页面被注入奇怪的代码，是不是中毒了？请教大神。

wordpress网站的PHP页面发现打开时异常缓慢，在服务器上查看网站里所有的PHP文件，发现被注入一段奇怪的代码，求大神看看是不是中毒或者什么的？


代码如下：
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