php下免费的加速器，PHP Accelerator

　　http://php-accelerator.co.uk/ 可以下载，是zend的强劲对手。是免费的。我已经在用啦。效果还不错。

修改 php.ini 加上：

zend_extension = /usr/local/lib/php_accelerator_1.3.3r2.so

phpa = on

phpa.tweaks = on

phpa.cache_dir = /tmp

phpa.file_perms = 400

phpa.cache_file_prune_period = 1h

phpa.cache_file_ttl = 1d

phpa.shm_size = 10

phpa.shm_key = 0xc0deb00

phpa.shm_perms = 666

phpa.shm_user = nobody

phpa.shm_group = nobody

phpa.shm_release_at_exit = on

phpa.shm_stats_check_period = 5m

phpa.shm_ttl = 12h

phpa.shm_max_processes = 512

phpa.shm_lock_threshold0 = 10

　　apachectl graceful 就能用啦。具体参数看它的文档。