PHP File compression zlib. output_compression and ob_gzhandler,

PHP File compression zlib. output_compression and ob_gzhandler,

Source:
\ ThinkPHP3.1.3 _ full \ ThinkPHP \ Lib \ Core \ App. class. php init () method
If (C ('output _ encode ')){
$ Zlib = ini_get ('zlib. output_compression ');
If (empty ($ zlib) ob_start ('ob _ gzhandler ');
}

Zlib. output_compression and ob_gzhandler are the methods for compressing the page intranet,
Ob_gzhandler () and zlib. output_compression cannot be used at the same time.
Note that zlib. output_compression is better than ob_gzhandler ().


There are three ways to use the ob_gzhandler function to compress php:
1. Set output_handler = ob_gzhandler in php. ini.
2. Add php_value output_handler ob_gzhandler to. htaccess.
3. Add ob_start ('ob _ gzhandler') to the PHP file header ');


Zlib. output_compression method:
Open the php. ini file in the php Directory, find zlib. output_compression = Off, and change it to zlib. output_compression = On,
Remove the; zlib. output_compression_level; and change-1 to 1 ~ The value of 5,
In this way, the gzip effect of all php pages can be achieved.
Note the following:
I. zlib. output_handler must be commented out because this parameter conflicts with the previous settings-the official statement.
2. Generally, the cache is 4 k (output_buffering = 4096 ).
3. The recommended parameter value of zlib. output_compression_level is 1 ~ 5 or 6, the actual compression effect is not significant, but the cpu usage is a geometric increase.


Example01: ob_gzhandler Method for earlier IE versions:

<?php/*The Accept-Encoding header can't be trusted in IE5 and unpatched IE6;there are 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:*/ function isBuggyIe() {     $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"); 

 

Example02: css/jss File Processing

<? Php/* It is also possible to use ob_gzhandler to compress css and javascript files, however some browsers such as firefox keep CT 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"); // or header ("Content-Type: text/javascript"); header ("Content-Length :". ob_get_length (); ob_end_flush ();

 

// To be supplemented...