Php sets the static content cache time

When using the Baidu tool for a small test, we were prompted that we had to set the static content cache time. I had no server permission to operate on myself and had to start from other aspects, after I searched for php, I found that I could use the header function to cache pages in the browser... when using the Baidu tool for a small test, we were prompted that we had to set the static content cache time. I had no server permission to operate on myself and had to start from other aspects, after I searched for php, I found that I could use the header function to cache pages in the browser.

Set the static content cache time. the code is as follows:

$interval = 60 * 60 * 6; // 6 hours  header ("Last-Modified: " . gmdate ('r', $max));  header ("Expires: " . gmdate ("r", ($max + $interval)));  header ("Cache-Control: max-age=$interval");

We add the above code to the beginning of the PHP file. The following describes the four lines of code. the code is as follows:

$ Interval = 60*60*6; // 6 hours header ("Last-Modified :". gmdate ('R', $ max); header ("Expires :". gmdate ("r", ($ max + $ interval); header ("Cache-Control: max-age = $ interval "); $ aid = intval (isset ($ _ POST ['aid '])? $ _ POST ['aid ']: 0); if (! $ Aid) // open source code phprm.com {echo 'undefined ads';} else if ($ aid = 1) {echo 'load ad content ';}

The first line: $ interval tells you that it has been set for six hours. you can customize it here.

Row 2: send a Last-Modified request to the client browser, which calls the corresponding date based on the gmdate parameter r.

Row 3: the expiration time of Expires is set.

Row 4: Set the max-age = $ interval date of Cache-Control.

The test result is excellent.

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