需要的库 yum install libxml2.x86_64 libxml2-devel.x86_64 libjpeg.x86_64 libpng.x86_64 libcurl-devel.x86_64 libcurl.x86_64 libjpeg-devel libjpeg.x86_64 libpng.x86_64 freetype.x86_64 libjpeg-devel.x86_64 libpng-devel.x86_64 freetype-devel.x86_64 epel-release.noarch libmcrypt.x86_64 libmcrypt-devel.x86_64 -y
若在安装discuz时，无法安装，提示错误如下：advice_mysqli_connect
解决办法：重新安装php,需要添加--with-mysqli选项
