Directadmin控制面板默认安装好zend并没有开启，如何开启zend呢?下面是具体方法
第一步，进入da目录,修改options.conf
[root@my2 ~]# cd /usr/local/directadmin/custombuild/
[root@my2 custombuild]# vi options.conf
第二步，找到zend = no改成zend =yes，然后再执行./build zend，完成后会看到下面的提示
[root@my2 custombuild]# ./build zend
File already exists: ZendOptimizer-3.3.3-linux-glibc23-i386.tar.gz
Zend Optimizer has been installed.
第三步，然后重启下apache即可
[root@my2 ~]# service httpd restart
第四步，查看
[root@my2 ~]# php -v
PHP 5.2.17 (cli) (built: May 22 2012 02:47:56)
Copyright (c) 1997-2010 The PHP Group Zend Engine v2.2.0,
Copyright (c) 1998-2010 Zend Technologies with Zend Optimizer v3.3.3,
Copyright (c) 1998-2007, by Zend Technologies