keeping session alive

[gvp16]

Hi all, ive got a bit of code that im using to try and keep a session alive but its not working, it uses javascript to refresh an 1x1 px image generated by php. I had this working on a previous project but no longer have the source code for it.

 

Heres what I have.

 

<------main.php----->

<SCRIPT language="JavaScript" type="text/javascript">

  var t = 300 // interval in seconds

  image = "blank1x1.php" //name of the image

  function Start() {

  tmp = new Date();

  tmp = "?"+tmp.getTime()

  document.images["refresh"].src = image+tmp

  setTimeout("Start()", t*1000)

  }

  Start();

</SCRIPT>

 

<------blank1x1.php----->

<?

$img = imagecreate( 1, 1 );

header( "Content-type: image/jpeg" );

imagejpeg($img);

imagedestroy($img);

?>

 

any help would be great, thanks.

[kenrbnsn]

What do you mean by "Keeping the session alive?"

 

Also, is this a Javascript question or a PHP question? It looks more like a Javascript question.

 

Ken

[gvp16]

Im using a php session to keep a user logged on, after about half hour of inactivity the user gets logged out.  i think the javascript part is working correctly as it loads the file that makes the image. Ive read that just refreshing an image isnt enough to keep a session alive as it is on the server and would need a server interaction, hence the php script to generate the image.

 

its a bit of both question.

 

Thanks.

[PFMaBiSmAd]

As long as you execute a session_start() statement in the .php code that is being requested, you don't need to do anything else, such as outputting an image.

[gvp16]

Works perfect! thanks