下载oci8扩展包：
http://pecl.php.net/package/oci8
cd到解压目录执行phpize,发现错误，
错误提示：
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.
解决方法：
curl -OL http://ftpmirror.gnu.org/autoconf/autoconf-latest.tar.gztar xzf autoconf-latest.tar.gz
cd autoconf-*./configure --prefix=/usr/local
make
sudo make install
phpize后继续安装
./configure --with-php-config=[php-config路径]
一个警告：
WARNING: OCI8 extension: ORACLE_HOME is not set, looking for default Oracle Instant Client instead
checking Oracle Instant Client directory... configure: error: Oracle Instant Client directory /usr/lib/oracle/.../client64/lib libraries not found. Try --with-oci8=instantclient,DIR
看来还得装oracle客户端。
去http://www.oracle.com/technetwork/topics/intel-macsoft-096467.html下载
instantclient-basic-macos.x32-11.2.0.4.0.zip
instantclient-sqlplus-macos.x32-11.2.0.4.0.zip
instantclient-sdk-macos.x32-11.2.0.4.0.zip
三个文件解压后放到同一文件夹内，全部移动到/usr/local/instantclient_11_2/
创建软连接
sudo ln -s /usr/local/instantclient_11_2/sdk/include/*.h /usr/local/include/
sudo ln -s /usr/local/instantclient_11_2/sqlplus /usr/local/bin/
sudo ln -s /usr/local/instantclient_11_2/*.dylib /usr/local/lib/
sudo ln -s /usr/local/instantclient_11_2/*.dylib.11.1 /usr/local/lib/
sudo ln -s /usr/local/lib/libclntsh.dylib.11.1 /usr/local/lib/libclntsh.dylib
测试一下/usr/local/bin/sqlplus，能运行说明成功了
好吧，继续安装oci8扩展包
./configure --with-php-config=[php-config路径] --with-oci8=instantclient,/usr/local/lib
最后在php.ini文件中加入
extension=oci8.so
重启apache。