CentOS系统装不了mbstring库

Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/mbstring.so' - /usr/lib/php/modules/mbstring.so: undefined symbol: second_arg_force_ref in Unknown on line 0

谢谢大家，解决了
重装了PHP预编译时添加了扩展

http://blog.cancanyou.com/post-212/%E7%BB%99CentOS+%E5%AE%89%E8%A3%85+php-mbstring/

so 文件不对
你直接用yum装不好么？