C2是單選
Merge branch 'master' of github.com:mousems/NTUvote102-2

# By Inndy
# Via Inndy (1) and MouseMs (1)
* 'master' of github.com:mousems/NTUvote102-2:
  Fixing security issue from get_client_ip
fix the security issue:preg_match return value type might be FALSE