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 |
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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) ;
}
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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...
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