apc 安装下了最新的APC-3.0.18.tgz，解压，进入目录
apc下载地址 http://pecl.php.net/package/APC
/usr/local/php/bin/phpize （生产configure文件）
./configure --enable-apc --enable-apc-mmap --with-php-config=/usr/local/bin/php-config
Make make.Install
cp /usr/local/lib/php/extensions/no-debug-zts-20060613/apc.so /usr/local/lib/php/extensions/apc.so
chmod 755 /usr/local/lib/php/extensions/apc.so
配置/etc/php.ini 末尾加入
extension=apc.so
apc.enabled = 1
apc.cache_by_default = on
apc.shm_segments = 1
apc.shm_size = 128
apc.ttl = 7200
apc.user_ttl = 7200
apc.num_files_hint = 1024
apc.write_lock = On
apc.gc_ttl=3600
apc.ttl=0
apc.mmap_file_mask=/tmp/apc.XXXXXX
重启apache
原文：http://www.jb51.net/os/RedHat/1322.html