php简单开启gzip压缩方法(zlib.output_compression)
一般而言，页面文件开启gzip压缩以后，其体积可以减小60%~90%，对于文字类站点，可以节省下大量的带宽与用户等待时间。但是不论是iis还是apache默认都只压缩html类静态文件，对于php文件需要模块配置才可支持（iis7.5中开启动态+静态压缩也可以），于是利用php自身功能到达gzip的效果也成为一项合理的诉求。
网上的教程基本是你抄我来我抄他，不外乎加头加尾或者自构函数两种写法。实际上每个php页面都要去加代码??当然也可以include引用，不过总显得略微麻烦。
实际上最简单的办法，打开php目录下的php.ini文件，找到zlib.output_compression = Off，改成zlib.output_compression = On，
再把;zlib.output_compression_level前面的;去掉，后面的-1改成1~5的数值。这样便可以实现所有php页面的gzip效果，不再需要单独修改网站的php文件??如果站点很多的话，会节省很多时间。
需要说明的是以下几点
一、;zlib.output_handler必须保持注释掉，因为此参数和前面的设置冲突??官方的说法。
二、一般情况下缓存是4k（output_buffering = 4096）。
三、zlib.output_compression_level 建议参数值是1~5，6以实际压缩效果提升不大，cpu占用却是几何增长。
图1.通过firebug查看请求头和回应头，实际上gzip效果已经显示
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