第一步：先安装freetds及相关库

yum install freetds freetds-devel
yum install php-devel
yum install gcc
yum install re2c

第二步：下载php源码及编译sybase扩展

wget http://cn2.php.net/get/php-5.4.32.tar.bz2/from/this/mirror
tar jxvf php-5.4.32.tar.bz2
cd php-5.4.32/ext/sybase_ct/
phpize
./configure --with-sybase-ct=/usr
make
make install

第三步：载入PHP的sybase扩展

cd /etc/php.d
vim sybase_ct.ini
extension=sybase_ct.so