Lamp架构 PHP 5.3.29
#查看php是否有mbstring模块
php -m | grep mbstring
yum install php-mbstring -y
find / -name mbstring.so
vim php.ini
extension = "/usr/lib64/php/modules/mbstring.so"
apachectl -k restart
PHP Fatal error: Call to undefined function mb_substr()
原文：http://www.cnblogs.com/metasequoia/p/3974521.html