PHP set up Dynamic Web pages in the browser cache static Web page and Dynamic Web page dynamic Picture page dynamic picture system

Many people may not know that dynamic Web pages can also be cached in the browser. The following is a PHP script as an example of how to set up a dynamic Web page in the browser cache

Set page expiration time to 1 hours

$duetime = 3600*24*30;

//Get browser will transfer to server last-modified Header

$modify _time = $_server[' http_if_modified_since ');

//When the browser accesses the webpage again within the set time, send the HTTP 304 status code, which saves the amount of data transferred.

if (Strtotime ($modify _time) + $duetime > Time ())

{

Header (' http/1.1 304 ');

Exit (1);

}

Header (' connection:keep-alive ');

//Set up Web pages last-modified Header

Header (' last-modified: '. Gmdate (' d, D M Y h:i:s '). ' GMT ');

Set Page Expiration time

Header (' Expires: '. Gmdate (' d, D M Y h:i:s ', time () + $duetime). ' GMT ');

//execute cache for a long time, with Expires a bit similar, allows us to more fully control the page expiration time, because the browser time may not be coordinated with the server time, with Cache-control header can be limited

Header (' cache-control:max-age= '. $duetime);

Output content

......

?>

Original: http://woqilin.blogspot.com/2014/05/php.html

The above describes the PHP settings Dynamic Web page in the browser cache, including dynamic Web pages, browser content, I hope to be interested in PHP tutorial friends helpful.

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