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php ob_start(ob_gzhandler)进行网页压缩

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Jun 13, 2016 am 09:47 AM

phpstartaboutcompressionSummarizearticleWeb pageconduct

本文章来总结关于php ob_start(ob_gzhandler)进行网页压缩传输的实现有需要的朋友可参考一下。

先来看ob_start用法

使用PHP ob_start()函数打开browser的cache，这样可以保证cache的内容在你调用flush(),ob_end_flush()（或程序执行完毕）之前不会被输出

代码如下

复制代码

ob_start(); //打开缓冲区
phpinfo(); //使用phpinfo函数
$info=ob_get_contents(); //得到缓冲区的内容并且赋值给$info
$file=fopen(’info.txt’,'w’); //打开文件info.txt
fwrite($file,$info); //写入信息到info.txt
fclose($file); //关闭文件info.txt

PHP ob_start()函数一个很大的特点；也可以使用ob_start的参数，在cache被写入后，然后自动运行命令，比如ob_start(”ob_gzhandler”)；而我们最常用的做法是用ob_get_contents()得到cache中的内容

面的代码是一个压缩网页的例子，我们利用ob_gzip函数，使用ob_start将输出内容压缩后放到“缓冲区”后再输出。

代码如下

复制代码

//启用压缩
if(function_exists('ob_gzip'))
{
   ob_start('ob_gzip');
}
//准备一些待压缩的内容
for($i=0; $i {
    echo('这里是测试内容
');
}
//输出压缩成果
ob_end_flush();


//这是ob_gzip压缩函数
function ob_gzip ($content)
{
    if( !headers_sent() && extension_loaded ("zlib") && strstr ( $_SERVER["HTTP_ACCEPT_ENCODING"], "gzip")){
        $content = gzencode($content,9);
        header ("Content- Encoding: gzip");
        header ("Vary: Accept- Encoding");
        header ("Content- Length: ".strlen ($content));
    }
    return ($content) ;
}

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