php ob_start(ob_gzhandler) for web page compression

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Jul 13, 2016 am 10:44 AM

php start about compression Summarize article Web page conduct

This article summarizes the implementation of web page compression and transmission using php ob_start (ob_gzhandler). Friends in need can refer to it.

Let’s first look at the usage of ob_start

Use the PHP ob_start() function to open the browser's cache. This ensures that the contents of the cache will not be output before you call flush(), ob_end_flush() (or the program is executed)

The code is as follows

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

Copy code

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<100; $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) ;
}

ob_start(); //Open buffer
phpinfo(); //Use phpinfo function
$info=ob_get_contents(); //Get the contents of the buffer and assign it to $info
$file=fopen(’info.txt’,’w’); //Open the file info.txt
fwrite($file,$info); //Write information to info.txt
fclose($file); //Close file info.txt ?>

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