PHP file compression zlib.output_compression and Ob_gzhandler

Source of the problem:
Init () method in \thinkphp3.1.3_full\thinkphp\lib\core\app.class.php
if (C (' Output_encode ')) {
$zlib = Ini_get (' zlib.output_compression ');
if (empty ($zlib)) Ob_start (' Ob_gzhandler ');
}

Zlib.output_compression and Ob_gzhandler are ways to compress the intranet of a page,
You cannot use Ob_gzhandler () and zlib.output_compression at the same time.
Also be aware that using zlib.output_compression is better than Ob_gzhandler ().


There are 3 ways to compress PHP using the Ob_gzhandler function:
1. Set Output_handler = Ob_gzhandler in php.ini
2. Add Php_value output_handler Ob_gzhandler in. htaccess
3, add Ob_start (' Ob_gzhandler ') in PHP file header;


Zlib.output_compression Method:
Open the php.ini file in the PHP directory, find zlib.output_compression = Off, change to zlib.output_compression = ON,
To Zlib.output_compression_level in front of, to remove, and to change the value of 1 in the back.
This will enable the Gzip effect on all PHP pages.
The following points need to be explained:
The Zlib.output_handler must remain commented out, as this parameter conflicts with the previous setting-the official argument.
Second, in general, the cache is 4k (output_buffering = 4096).
Third, Zlib.output_compression_level recommended parameter value is 1~5,6 to the actual compression effect is not increased, CPU consumption is geometric growth.


Example01:ob_gzhandler method The processing of the lower version of IE:

<?PHP/*The accept-encoding header can ' t be trusted in IE5 and unpatched Ie6;there is gzip-related bugs in this browsers. The Docs don ' t mention if Ob_gzhandler knows about These,so you might want to use the function below:*/ functionIsbuggyie () {$ua=$_server[' Http_user_agent ']; //Quick escape for non-ies     if(0!==Strpos($ua, ' mozilla/4.0 (compatible; MSIE ')         ||false!==Strpos($ua, ' Opera ')) {         return false; }     //no regex = Faaast     $version= (float)substr($ua, 30); return (         $version< 6 | | ($version= = 6 &&false===Strpos($ua, ' SV1 '))     ); } //Usage:Isbuggyie () | |Ob_start("Ob_gzhandler"); 

Processing of EXAMPLE02:CSS/JSS files

 <? php  /*  it is also possible to use Ob_gzhandler to compress CSS and JavaScript files,however some BR Owsers such as Firefox expect content type text/css on CSS files. To get around this send a content type header:  */ ob_start  (' Ob_gzhandler ' ? > .... Your CSS content ... <? php  header   ("Content-type:text/css"); //  header  ("Content-length:".) ob_get_length   ());  ob_end_flush   ();  

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PHP file compression zlib.output_compression and Ob_gzhandler