在php运行期间，php引擎要对php源码进行处理，（词法分析，语法分析等）然后生成opcode。
然后再运行。在这个阶段可以把opcode缓存起来，当下次需要运行这段程序的时候，就避免了再次 进行词法分析，语法分析，直接拿opcode来用。
eAccelerator就是这样的程序。
用vld查看php的opcode：
http://pecl.php.net/package/vld/0.12.0/windows
在上面的地址下载vld，解压后 将 php_vld.dll，拷贝到ext目录下。
修改php.ini，增加“extension=php_vld.dll”；
要查看opcode，新建一个php脚本，cmd下执行
“E:xamppphp>php -dvld.active=1 e:htdocsmytest .php”命令。
显示结果：
E:xamppphp>php -dvld.active=1 e:htdocsmytest
.php
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 13, Position 2 = 6
Branch analysis from position: 13
Return found
Branch analysis from position: 6
Jump found. Position 1 = 3
Branch analysis from position: 3
Jump found. Position 1 = 1
Branch analysis from position: 1
filename: E:htdocsmytest
.php
function name: (null)
number of ops: 14
compiled vars: !0 = $i
line # * op fetch ext return operands
---------------------------------------------------------------------------------
30 0 > ASSIGN !0, 0
1 > IS_SMALLER ~1 !0, 100
2 > JMPZNZ 6 ~1, ->13
3 > POST_INC ~2 !0
4 FREE ~2
5 > JMP ->1
31 6 > CONCAT ~3 'a', !0
7 FETCH_W local $4 ~3
8 ASSIGN $4, !0
32 9 CONCAT ~6 'a', !0
10 FETCH_R local $7 ~6
11 ECHO $7
33 12 > JMP ->3
36 13 > > RETURN 1
branch: # 0; line: 30- 30; sop: 0; eop: 0; out1: 1
branch: # 1; line: 30- 30; sop: 1; eop: 2; out1: 13; out2: 6
branch: # 3; line: 30- 30; sop: 3; eop: 5; out1: 1
branch: # 6; line: 31- 33; sop: 6; eop: 12; out1: 3
branch: # 13; line: 36- 36; sop: 13; eop: 13
path #1: 0, 1, 13,
path #2: 0, 1, 6, 3, 1, 13,
012345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364
6566676869707172737475767778798081828384858687888990919293949596979899
安装eAccelerator：
下载:http://www.sitebuddy.com/php/accelerators/eaccelerator-windows-binaries
下载下来的文件解压后，将dll文件，贝到ext下
修改php.ini，开启
[eAccelerator]
zend_extension_ts="C:/php/ext/eaccelerator.dll" //路径根据实际情况而定
eaccelerator.shm_size="32" //根据系统内存来定，默认16M，可以改成64M
eaccelerator.cache_dir="C:/php/temp" //前面创建的缓冲文件夹
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"
配置redis：
下载http://www.redis.cn/download.html
解压后有两个dll文件，全部拷贝到ext目录下。[我拷贝到ext，还提示找不到。最后拷贝到php.exe目录下才不再报错]。
修改php.ini
添加
"extension=php_igbinary.dll
extension=php_vld.dll"
重启apache,phpinfo（）；可以查看是否启动。
测试redis：
$redis = new Redis();
$redis->connect("192.168.0.110","6379"); //php客户端设置的ip及端口
//存储一个 值
$redis->set("say","Hello World");
echo $redis->get("say"); //应输出Hello World
//存储多个值
$array = array('first_key'=>'first_val',
'second_key'=>'second_val',
'third_key'=>'third_val');
$array_get = array('first_key','second_key','third_key');
$redis->mset($array);
var_dump($redis->mget($array_get));