测试数据：
binab.exe -n 100 -c 5 http://www.plchome.org
未使用fastcgi时：
Concurrency Level: 5
Time taken for tests: 9.016 seconds
Complete requests: 100
Failed requests:0
Write errors: 0
Total transferred: 1696500 bytes
HTML transferred: 1669000 bytes
Requests per second:11.09 [#/sec] (mean)
Time per request: 450.781 [ms] (mean)
Time per request: 90.156 [ms] (mean, across all concurrent requests)
Transfer rate: 183.76 [Kbytes/sec] received
日志里显示，页面执行需要0.004s
Concurrency Level: 5
Time taken for tests: 3.203 seconds
Complete requests: 100
Failed requests:0
Write errors: 0
Total transferred: 1685400 bytes
HTML transferred: 1669000 bytes
Requests per second:31.22 [#/sec] (mean)
Time per request: 160.156 [ms] (mean)
Time per request: 32.031 [ms] (mean, across all concurrent requests)
Transfer rate: 513.84 [Kbytes/sec] received
日志里显示，页面执行时间为0s
提高的很明显！
配置主要参考：http://www.fuchaoqun.com/2011/01/nginx-fastcgi_cache/
配置参数：
http里：
fastcgi_cache_path /www/php_cache levels=1:2 keys_zone=cache_php:30m inactive=1d max_size=10g;
server里：
location ~ .*.php?$
{
#fastcgi_pass unix:/tmp/php-cgi.sock;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fcgi.conf;
#以下是fastcgi_cache的配置
fastcgi_cache cache_php;
fastcgi_cache_valid 200 302 1h;
fastcgi_cache_min_uses 1;
fastcgi_cache_use_stale error timeout invalid_header http_500;
fastcgi_cache_key $host$request_uri;
}
fastcgi_cache_path：fastcgi_cache缓存目录，可以设置目录层级，比如1:2会生成16*256个字目录，cache_php是这个缓存空间的名字，cache是用多少内存（这样热门的内容nginx直接放内存，提高访问速度），inactive表示默认失效时间，max_size表示最多用多少硬盘空间。本来还有个fastcgi_temp_path参数，但发现似乎没用。
fastcgi_cache_valid：定义哪些http头要缓存
fastcgi_cache_min_uses：URL经过多少次请求将被缓存
fastcgi_cache_use_stale：定义哪些情况下用过期缓存
fastcgi_cache_key：定义fastcgi_cache的key，示例中就以请求的URI作为缓存的key，Nginx会取这个key的md5作为缓存文件，如果设置了缓存哈希目录，Nginx会从后往前取相应的位数做为目录
fastcgi_cache：用哪个缓存空间
指定删除某一URL的php文件的缓存的PHP程序
大致代码：
复制代码 代码示例:
$md5 = md5($url);
$cacheFile = '/www/php_cache/' . substr($md5, -1, 1) . '/' . substr($md5, -3, 2) . '/' . $md5;
if (!file_exists($cacheFile)) {
exit('缓存不存在。');
}
if (@unlink($cacheFile)) {
echo '清除缓存成功。';
} else {
echo '清除缓存失败。';
}
