Fatal error: Cannot redeclare

I have a theme file that gets called via ajax and acts as a json service for other pages on the site. When I installed this plugin, the ajax file went all 500 and gave me the message:

Fatal error: Cannot redeclare <function name> (previously declared in (<…>functions.php:10) in <…>functions.php on line 30

It turns out, my theme’s functions.php was being included twice – once from WordPress and a second time from the plugin.

The problem is in twitter-posts-to-blog.php on the first two lines of code. Changing

require_once 'libs/twitteroauth/twitteroauth.php';
require_once 'functions.php';

to

$dir = plugin_dir_path( __FILE__ );
require_once($dir.'libs/twitteroauth/twitteroauth.php');
require_once($dir.'functions.php');

resolves the issue.

http://ww.wp.xz.cn/plugins/twitter-posts-to-blog/