php ob_start(ob_gzhandler) for web page compression_PHP tutorial

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)

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The code is as follows

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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   ?>

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代码如下

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//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) ;    }

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

A great feature of the PHP ob_start() function; you can also use the parameters of ob_start, and then automatically run the command after the cache is written, such as ob_start("ob_gzhandler"); and our most commonly used method is to use ob_get_contents () Get the content in cache 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

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//Enable compression if(function_exists('ob_gzip')) {  Ob_start('ob_gzip'); }  //Prepare some content to be compressed for($i=0; $i {  echo('Here is the test content '); }  //Output the compression results ob_end_flush(); //This is ob_gzip compression function function ob_gzip ($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...