note 42902 modified in function.session-cache-expire by danbrown

From:	danbrown@php.net	Date:	Mon, 09 Jul 2012 18:51:17 +0000
Subject:	note 42902 modified in function.session-cache-expire by danbrown
References:	1	Groups:	php.notes
Request:	Send a blank email to php-notes+get-189076@lists.php.net to get a copy of this message

Hello,
Some of my customers asked me for a solution form their session not to expire when filling large forms. Sometimes it takes them more than 2 hours to submit (phone, desk customers...). 
I know I could have forced an ilayer to be refreshed dynamically and then include PHP code using session_cache_expire() function, but this refreshing a page changes the form focus. So I found this the only solution for them not to loose focus over their form element.

You can make a session not to expire by using this code.
Its a mixture of PHP and JavaScript and can be used on the same page were your code goes or it can be called using an ilayer/iframe from your page. 

I know this is not the best practice, but in some cases were user has no control over server globals and security is not important this can help.

Here is the code.

<?php

//First of all we prevent browsers from caching the image
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); 

//This piece of code returns a blank gif
if($_GET[img] > 0){ 
	header('Content-Type: image/gif');
	header("Content-Disposition: inline; filename=".time().".gif");
	echo base64_decode(str_replace("\\n","","
R0lGODlhAQABAPcAAAAAAAAAQAAAgAAA/
wAgAAAgQAAggAAg/wBAAABAQABAgABA/
wBgAABgQABggABg/wCAAACAQACAgACA/
wCgAACgQACggACg/wDAAADAQADAgADA/
wD/AAD/QAD/gAD//yAAACAAQCAAgCAA/
yAgACAgQCAggCAg/yBAACBAQCBAgCBA/
yBgACBgQCBggCBg/yCAACCAQCCAgCCA/
yCgACCgQCCggCCg/yDAACDAQCDAgCDA/
yD/ACD/QCD/gCD//0AAAEAAQEAAgEAA/
0AgAEAgQEAggEAg/0BAAEBAQEBAgEBA/
0BgAEBgQEBggEBg/0CAAECAQECAgECA/
0CgAECgQECggECg/0DAAEDAQEDAgEDA/
0D/AED/QED/gED//2AAAGAAQGAAgGAA/
2AgAGAgQGAggGAg/2BAAGBAQGBAgGBA/
2BgAGBgQGBggGBg/2CAAGCAQGCAgGCA/
2CgAGCgQGCggGCg/2DAAGDAQGDAgGDA/
2D/AGD/QGD/gGD//4AAAIAAQIAAgIAA/
4AgAIAgQIAggIAg/4BAAIBAQIBAgIBA/
4BgAIBgQIBggIBg/4CAAICAQICAgICA/
4CgAICgQICggICg/4DAAIDAQIDAgIDA/
4D/AID/QID/gID//6AAAKAAQKAAgKAA/
6AgAKAgQKAggKAg/6BAAKBAQKBAgKBA/
6BgAKBgQKBggKBg/6CAAKCAQKCAgKCA/
6CgAKCgQKCggKCg/6DAAKDAQKDAgKDA/
6D/AKD/QKD/gKD//8AAAMAAQMAAgMAA/
8AgAMAgQMAggMAg/8BAAMBAQMBAgMBA/
8BgAMBgQMBggMBg/8CAAMCAQMCAgMCA/
8CgAMCgQMCggMCg/8DAAMDAQMDAgMDA/
8D/AMD/QMD/gMD///8AAP8AQP8AgP8A/
/8gAP8gQP8ggP8g//9AAP9AQP9AgP9A/
/9gAP9gQP9ggP9g//+AAP+AQP+AgP+A/
/+gAP+gQP+ggP+g///AAP/AQP/AgP/A/
///AP//QP//gP///yH5BAEAAP8ALAAAA
AABAAEAAAgEAP8FBAA7"));
	exit;
}

?>



<img name="keepUpdated" src="<?=$_SELF?>?img=999">
<script language="Javascript">

</script>

I hope this can be helpful for someone.

Bermi Ferrer --was-- Hello, Some of my customers asked me for a solution form their session not to expire when filling large forms. Sometimes it takes them more than 2 hours to submit (phone, desk customers...). I know I could have forced an ilayer to be refreshed dynamically and then include PHP code using session_cache_expire() function, but this refreshing a page changes the form focus. So I found this the only solution for them not to loose focus over their form element. You can make a session not to expire by using this code. Its a mixture of PHP and JavaScript and can be used on the same page were your code goes or it can be called using an ilayer/iframe from your page. I know this is not the best practice, but in some cases were user has no control over server globals and security is not important this can help. Here is the code. <? //First of all we prevent browsers from caching the image header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); header("Pragma: no-cache"); header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); //This piece of code returns a blank gif if($_GET[img] > 0){ header('Content-Type: image/gif'); header("Content-Disposition: inline; filename=".time().".gif"); echo base64_decode(str_replace("\n",""," R0lGODlhAQABAPcAAAAAAAAAQAAAgAAA/ wAgAAAgQAAggAAg/wBAAABAQABAgABA/ wBgAABgQABggABg/wCAAACAQACAgACA/ wCgAACgQACggACg/wDAAADAQADAgADA/ wD/AAD/QAD/gAD//yAAACAAQCAAgCAA/ yAgACAgQCAggCAg/yBAACBAQCBAgCBA/ yBgACBgQCBggCBg/yCAACCAQCCAgCCA/ yCgACCgQCCggCCg/yDAACDAQCDAgCDA/ yD/ACD/QCD/gCD//0AAAEAAQEAAgEAA/ 0AgAEAgQEAggEAg/0BAAEBAQEBAgEBA/ 0BgAEBgQEBggEBg/0CAAECAQECAgECA/ 0CgAECgQECggECg/0DAAEDAQEDAgEDA/ 0D/AED/QED/gED//2AAAGAAQGAAgGAA/ 2AgAGAgQGAggGAg/2BAAGBAQGBAgGBA/ 2BgAGBgQGBggGBg/2CAAGCAQGCAgGCA/ 2CgAGCgQGCggGCg/2DAAGDAQGDAgGDA/ 2D/AGD/QGD/gGD//4AAAIAAQIAAgIAA/ 4AgAIAgQIAggIAg/4BAAIBAQIBAgIBA/ 4BgAIBgQIBggIBg/4CAAICAQICAgICA/ 4CgAICgQICggICg/4DAAIDAQIDAgIDA/ 4D/AID/QID/gID//6AAAKAAQKAAgKAA/ 6AgAKAgQKAggKAg/6BAAKBAQKBAgKBA/ 6BgAKBgQKBggKBg/6CAAKCAQKCAgKCA/ 6CgAKCgQKCggKCg/6DAAKDAQKDAgKDA/ 6D/AKD/QKD/gKD//8AAAMAAQMAAgMAA/ 8AgAMAgQMAggMAg/8BAAMBAQMBAgMBA/ 8BgAMBgQMBggMBg/8CAAMCAQMCAgMCA/ 8CgAMCgQMCggMCg/8DAAMDAQMDAgMDA/ 8D/AMD/QMD/gMD///8AAP8AQP8AgP8A/ /8gAP8gQP8ggP8g//9AAP9AQP9AgP9A/ /9gAP9gQP9ggP9g//+AAP+AQP+AgP+A/ /+gAP+gQP+ggP+g///AAP/AQP/AgP/A/ ///AP//QP//gP///yH5BAEAAP8ALAAAA AABAAEAAAgEAP8FBAA7")); exit; } ?>  <img name="keepUpdated" src="<?=$_SELF?>?img=999"> <script language="Javascript">  </script> I hope this can be helpful for someone. Bermi Ferrer http://php.net/manual/en/function.session-cache-expire.php