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Home  >  Article  >  Backend Development  >  php ob_start(ob_gzhandler) for web page compression_PHP tutorial

php ob_start(ob_gzhandler) for web page compression_PHP tutorial

WBOY
WBOYOriginal
2016-07-13 10:44:311220browse

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 ?>

The above code is an example of compressing a web page. We use the ob_gzip function and ob_start to compress the output content and put it into the "buffer" before outputting it.
The code is as follows Copy code
//Enable compression
if(function_exists('ob_gzip'))
{ 
Ob_start('ob_gzip');
} 
//Prepare some content to be compressed
for($i=0; $i<100; $i++)
{ 
echo('Here is the test content
');
} 
//Output the compression results
ob_end_flush();


//This is ob_gzip compression function
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) ;
}
http://www.bkjia.com/PHPjc/633100.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/633100.htmlTechArticleThis 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 browsers...
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