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PHP program acceleration exploration compressed output gzip_PHP tutorial
PHP program acceleration exploration compressed output gzip_PHP tutorial
Using the mod_gzip module in Apache, we can use the gzip compression algorithm to compress the web page content published by the Apache server and then transmit it to the client's browser. If it is pure text content, the effect is very obvious, and it can be compressed to about 30%-40% of the original size, greatly speeding up the user's browsing speed.
Gzip requires client browser support. Currently, most browsers support gzip, such as IE, Netscape, Mozilla, etc., so this method is worth a try. We can use the predefined variable $_SERVER[‘HTTP_ACCEPT_ENCODING’] in PHP to determine whether the client browser supports gzip.
gzip1.php
if(ereg(gzip,$_SERVER[HTTP_ACCEPT_ENCODING])) {
} else { //The browser does not support it, output other content } ?＞ |
Next, we extend the above PHP program and use ob_start(ob_gzhandler) to compress the web page content, store it in the buffer and send it to a browser that supports gzip. The browser will automatically decompress and display the compressed content.
| define(MAX,100); if(ereg(gzip,$_SERVER[HTTP_ACCEPT_ENCODING])) { //浏览器支持gzip，将内容压缩并缓冲输出 ob_start("ob_gzhandler"); $output = ; for($i=0;$i<=MAX;$i++) { $output .= "This is line $i "; } echo "浏览器支持gzip压缩输出"; echo $output; } else { //浏览器不支持，直接输出 for($i=0;$i<=MAX;$i++) { $output .= "This is line $i "; } echo "浏览器不支持gzip压缩输出 "; echo $output; } ?＞ |
gzip2.php
define(MAX,100);
if(ereg(gzip,$_SERVER[HTTP_ACCEPT_ENCODING])) { //The browser supports gzip, which compresses the content and buffers the output ob_start("ob_gzhandler"); $output = ; for($i=0;$i<=MAX;$i++) echo "The browser does not support gzip compressed output"; echo $output;
}
?＞ |
| Content-Encoding: gzip Content-Length: 270 |
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