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PHP如何给网站开启压缩输出增强网站访问速度

Jun 13, 2016 am 09:36 AM
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分享两种压缩页面输出数据以提高网页访问速度的方法,一种是通过使用php zlib扩展实现页面gzip压缩输出(使用php的内置函数ob_gzhandler进行gzip压缩输出),另外一种方法是是通过修改php.ini配置文件开启php gzip以实现压缩页面信息压缩传输,现在分别详细分享一下这两种方法分别是如何实现的!

(1)通过php的内置函数ob_gzhandler进行gzip压缩输出

在页面头部添加如下代码:

if(extension_loaded('zlib') && strstr($_SERVER['HTTP_ACCEPT_ENCODING'],'gzip')){
    ob_start('ob_gzhandler');
}else{
    exit('php zlib使用失败,请确认是否已加载zlib扩展');
}
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在页面尾部添加如下代码:

if(extension_loaded('zlib')){ob_end_flush();}
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下面分别是访问不同的域名但信息完全相同的两个网站,结果如下图:

(2)通过修改php.ini配置文件实现开启或关闭php gzip以实现压缩页面信息压缩传输
 
一、找到并打开php.ini配置文件,找到zlib.output_compression = Off,将

zlib.output_compression = Off   
;zlib.output_compression_level = -1
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修改为:

zlib.output_compression = On   
zlib.output_compression_level = 6
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php gzip配置知识点:

1、默认php是不开启zlib整站压缩输出的,而是通过对需要压缩输出的页面使用ob_gzhandler函数实现,两者只能二选一,否则会报错。
 
2、zlib.output_compression默认值为Off,你可以将其设置为On,或者output buffer size(默认为4k)
 
3、zlib.output_compression_level代表压缩比,默认推荐设置压缩比值为6,可选范围为1-9,-1代表关闭php zlib(gzip)压缩
 
二、保存php.ini配置文件,并重启apache服务器
 
三、打开apache 配置文件httpd.conf,配置装载deflate_module。这一步是最关键的开启php gzip压缩输出配置步骤,方法如下,找到

#LoadModule deflate_module modules/mod_deflate.so
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这一段并去除开头的#号,然后重启apache即可。

注意:这种办法是相对于php版本大于4.3来说的,php4.3版本以前的需要另外单独安装zlib的。另外本人使用的是phpnow搭建的php服务器,直接修改php.ini(phpnow的php相关选项配置文件是php-apache2handler.ini)的相关配置并重启apache就行了,不用第二步操作。

下面分别是访问不同的域名但信息完全相同的两个网站,结果如下图:

 

具体看效果可用火狐浏览器查看,右键点击网页,弹出的菜单中有个查看页面信息选项,弹出的窗口看大小那一项就是了。本人网站未有实现改功能,悲哀的是本人空间不支持gzip压缩功能,代码也不能实现!

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