用php加速器eaccelerator加速php脚本执行速度eaccelerator是一个开源软件，它能加速，优化，编码与缓存php脚本，通过在php编译时缓存php脚本，能大大提高 php脚本的执行效率，这点针对纯php脚本编写的网站来说，它能明显降低web服务的负载从而使你的网页处理速度能提高1-10倍只针对php脚本的网点，你可能通过ab来测试你的web服务器在装与没装eaccelerator时进行测试。
1。软件下载地址
2。安装
export PHP_PREFIX="/usr"＃＃php安装目录，请根据你的安装环境指定
$PHP_PREFIX/bin/phpize
./configure \
--enable-eaccelerator=shared \
--with-php-config=$PHP_PREFIX/bin/php-config
make
make install
3。修改php.ini配置文件，将下面内容添加到文件未尾
install as Zend extension:
zend_extension="/usr/lib/php4/eaccelerator.so"
eaccelerator.shm_size="16"＃＃＃注意，这个值不能太多（可以通过更改内核配置文件来达到你要的值，具体是哪个文件我忘了，因为是外网服务器，我也不好调试，如果你知道，请告诉我
，默认为16M，如果你想更改，请慢慢调试，如果更改后出现无法启动apache现象，请注意apache的错误日志，按里面的要求做。
eaccelerator.cache_dir="/tmp/eaccelerator"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="0"
eaccelerator.shm_prune_period="0"
eaccelerator.shm_only="0"
eaccelerator.compress="1"
eaccelerator.compress_level="9"
4。建立缓存目录
mkdir /tmp/eaccelerator
chmod 0777 /tmp/eaccelerator
5。Configuration Options
---------------------
eaccelerator.shm_size
共享内存大小，设为0为你操作系统默认值
eaccelerator.cache_dir
eAccelerator存取预编php代码的目录，默认为"/tmp/eaccelerator"，注意这个文件的权限
eaccelerator.enable
是否开启aeccelerator加速引擎
eaccelerator.optimizer
是否开启eaceelerator优化功能
eaccelerator.debug
Enables or disables debug logging. Should be "1" for enabling or "0" for
disabling. Default value is "0".
eaccelerator.check_mtime
Enables or disables PHP file modification checking . Should be "1" for
enabling or "0" for disabling. You should set it to "1" if you want to
recompile PHP files after modification. Default value is "1".
eaccelerator.filter
Determine which PHP files must be cached. You may specify the number of
patterns (for example "*.php *.phtml") which specifies to cache or not to
cache. If pattern starts with the character "!", it means to ignore files
which are matched by the following pattern. Default value is "" that means
all PHP scripts will be cached.
eaccelerator.shm_max
是否限制共享内存最大值，0是不限制
eaccelerator.shm_ttl
When eaccelerator fails to get shared memory for new script it removes all
scripts which were not accessed at last "shm_ttl" seconds from shared
memory. Default value is "0" that means - don't remove any files from
shared memory.
eaccelerator.shm_prune_period
When eaccelerator fails to get shared memory for new script it tryes to
remove old script if the previous try was made more then
"shm_prune_period" seconds ago. Default value is "0" that means - don't
try to remove any files from shared memory.
eaccelerator.shm_only
Enables or disables caching of compiled scripts on disk. It has no effect
on session data and content caching. Default value is "0" that means - use
disk and shared memory for caching.
eaccelerator.compress
Enables or disables cached content compression. Default value is "1" that
means enable compression.
eaccelerator.compress_level
Compression level used for content caching. Default value is "9" which is
the maximum value
eaccelerator.name_space
A string that's prepended to all keys. This allows two applications that
use the same key names to run on the same host by setting this in .htaccess
or in the main configuration file for the whole webserver.
eaccelerator.keys
eaccelerator.sessions
eaccelerator.content
Determine where keys, session data and content will be cached. The possible
values are:
"shm_and_disk" - cache data in shared memory and on disk (default value)
"shm" - cache data in shared memory or on disk if shared memory
is full or data size greater then "eaccelerator.shm_max"
"shm_only" - cache data in shared memory
"disk_only" - cache data on disk
"none" - don't cache data
eaccelerator.allowed_admin_path
The script paths that are allowed to get admin information and do admin
controls
重启apache马上测试下，是不是快了很多
