介绍几种PHP站点性能的优化方法
如果能够合理运用
1:object code缓存
每次发生一个请求的时候,都需要把你对象代码重新编译一遍,如果你使用了缓存,那么就避免了重新编译,这样可以使得你的脚本执行得更快,提高PHP站点性能。
有以下的包可以使用:
A) Ioncube:http://www.ioncube.com/
B) Zend Encoder: http://www.zend.com/products/zend_safeguard
C) Turckl MMCache: http://freshmeat.net/projects/turck-mmcache/
2:模板系统
模板系统提供了另外一种不同的缓存形式。内容缓存。当你有很多静态数据和很多页面不需要reload的时候,模板系统是很有帮助的。缓存系统也将code和html分开,不仅使得代码的执行时间改善,也让你将来的维护变得容易,提高了PHP站点性能。
A) Smarty Templates: http://smarty.PHP.net/
B) Pear Templates: http://pear.PHP.net/package/html_template_it/redirected
C) PHP savant: http://PHPsavant.com/yawiki/
3:分布式对象缓存系统
使用得最普遍的是memcached
这种系统把数据库数据放在一个很大的内存池里,这样使得你的网站跑得很快,实现了PHP站点性能的优化。
4:设置一些PHP变量
variables_order = ‘GPC’
register_argc_argv = ‘Off’
register_globals = ‘Off’
always_populate_raw_post_data = ‘Off’
magic_quotes_gpc = ‘Off’
5: Output Compression
几乎所有的浏览器都支持Gzip的压缩方式,gzip可以降低80%的输出,付出的代价是大概增加了10%的cpu计算量。但是赚到的是不仅占用的带宽减少了,而且你的页面加载会变得很快,优化了你的PHP站点性能。
你可以在PHP.ini中开启它
zlib.output_compression = On
zlib.output_compression_level = (level)(level可能是1-9之间的数字,你可以设置不同的数字使得他适合你的站点。)
如果你使用apache,你也可以激活mod_gzip模块,他是高度可定制的。
6:其他
当你使用数据库的时候,只取那些你需要使用的数据,避免使用select * from mytable这样的句子。
另外使用索引也是对PHP站点性能的优化很有帮助的。

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