我刚刚发现了问题.逐项调试后，问题是WordPress不允许您运行file_get_contents，而必须像这样使用wp_remote_get:

I just found the problem. After debugging every bit item by item, the problem is that WordPress doesn't allow you to run file_get_contents, instead you have to use wp_remote_get like this:

GOOD: $json = wp_remote_get( $social['twitter'].$url );
BAD: $json = file_get_contents($social['twitter'].$url, false);

我只是浪费了一整天的时间，所以我希望它可以帮助其他人.

I just wasted a full day on this so I hope it helps someone else.