今天项目升级到php5.4，gbk编码，htmlspecialchars转换后的字符串为空，郁闷啊
解决，加上编码吧，这么多地方用到htmlspecialchars，改起来真麻烦，看来以后得自己封装一下了。
upgrading说到
[html]
- the default character set for htmlspecialchars() and htmlentities() is 
  now utf-8. in previous versions it was iso-8859-1. note that changing 
  your output charset via the php.ini default_charset directive does not 
  affect htmlspecialchars/htmlentities unless you are passing (an  
  empty string) as the encoding parameter to your htmlspecialchars/htmlentities 
  calls.  
手册中也说到
[html] 
string htmlspecialchars ( string $string [, int $flags = ent_compat | ent_html401 [, string $encoding = 'utf-8' [, bool $double_encode = true ]]] ) 
[html] 
defines encoding used in conversion. if omitted, the default value for this argument is iso-8859-1 in versions of php prior to 5.4.0, and utf-8 from php 5.4.0 onwards.
作者：xanxng
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