...and whether it was cached 30 days ago,,
I am using this code:
$page=get_headers('http://www.w3schools.com/php/func_date_strtotime.asp');
The output is this:
0=>HTTP/1.1 200 OK1=>Connection: close
2=>Date: Thu, 03 May 2012 10:51:00 GMT
3=>Server: Microsoft-IIS/6.0
4=>MicrosoftOfficeWebServer: 5.0_Pub
5=>X-Powered-By: ASP.NET
6=>Pragma: no-cache
7=>Content-Length: 23643
8=>Content-Type: text/html
9=>Expires: Thu, 03 May 2012 10:50:00 GMT
10=>Set-Cookie: ASPSESSIONIDSAARQQST=AAMAAHBBBHBELMHDCHNNLMFP; path=/
11=>Cache-control: no-cache
I read that pragma cache , doesnt necessary mean that the page is uncacheable.
I want to know 2 things: 1) if the page is cached 2) if it was cached 30 days ago.
Can I do this
$date1=gmdate("D, d M Y H:i:s", strtotime("30 days ago")) . " GMT";
$date2=$page['Expires'];
if($date1>$date2)
{
echo 'The page was cached for longer than 30 days';
}
Since PHP is a server side language you cannot check browser cache(which is a client side) using PHP. So you need some client side scripting like Javascript and not server side programming like PHP.