我有几个Wordpress网站，但都已关闭：

服务器尝试满足请求时遇到意外情况。错误代码：500

当我查看apache日志时，会出现错误（针对不同的站点）：

[Mon Apr 15 04:00:28 2013] [error] [client ...] PHP Parse error:  syntax error, unexpected \'$mm\' (T_VARIABLE) in /var/www/SITEA/html/wp-includes/functions.php on line 192, referer: http:...
[Mon Apr 15 04:00:55 2013] [error] [client ...] PHP Parse error:  syntax error, unexpected \'$mm\' (T_VARIABLE) in /var/www/SITEB/html/blog/wp-includes/functions.php on line 183
[Mon Apr 15 04:01:42 2013] [error] [client ...] PHP Parse error:  syntax error, unexpected \'$mm\' (T_VARIABLE) in /var/www/SITEC/html/wp-includes/functions.php on line 203