今天使用数据中心的DOI注册功能后，突然发现后台验证的功能无法使用。代码没有动过，怀疑是服务器升级导致产生的，于是再本地升级到最新版后再进行测试发现正常，在服务器上升级后仍然有错误。看了代码，错误是在这一句导致的：
$content=@file_get_contents("http://dx.doi.org/".$row['doi']);
感觉这个代码应该没有问题，ping一下对应的网站，发现其默认是解析到ipv6网络了，同时ipv6网络不通，所以导致了这个问题。
临时解决办法：在/etc/hosts中将对应的域名直接解析为ipv4地址。
在新服务器上再次发现同样的问题。
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