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Sending out holding pages before final result page
Sticky fields and session example from a Well House Consultants training course
More on Sticky fields and session [link]

This example is described in the following article(s):
   • Automating access to a page obscured behind a holding page - [link]

If you're searching for a page where you can try this code, select here

Source code: dozen.php Module: H301

/* This script shows one of several methods that a server can
use to provide intermediate "please wait" pages back to a browser.

On first request, a cookie is send out together with a page which
includes a refresh header.   The client keeps asking for the page
at the interval speciied each time in the refresh header, until
the final result is presented.  When the final result is sent out,
it does NOT include a refresh header and it deletes the cookie by
resetting it with a negative time. */

if ($_COOKIE[colin]) {
# Second and subsequent time through
$elapsed time () - $_COOKIE[colin] ;
#  -- See how background processing is doing here  --
} else {
# First time through / arrival at this page

        # We are very crudely setting cookie value to start time
        # in this demo so that we can check the time without
        # having to set up temporary files, etc. Would probably
        # be a good idea to use PHP's sessions in a live
        # application, but I wanted to show the principles here.

$elapsed 0;
#  -- Start off background processing here --

/* Have we reached the end of the processing?  (In this test program
we are simply waiting 20 seconds but with a live program we would be
testing the status returned from the background process */

if ($elapsed 20) {
# We're sending (another) "please wait" page
$mh '<meta http-equiv="Refresh" content="5; URL=/demo/dozen.php">';
$report "%start% Running ... $elapsed seconds gone %end%";
} else {
# We're sending final result - NO refresh headed
        # And a backward timed cookie to clear out the browser
$mh '';
$sayvalend = `uptime`;
$report "%start% Completed ... \n$sayvalend %end%";
<title>Waiting for a result and keeping the user amused</title>
<?= $mh ?>
<h1>This is something I needs to thinks about ...</h1>

<b><?= $report ?></b><br>

Learn about this subject
This module and example are covered on our public PHP Techniques course. If you have a group of three or more trainees who need to learn the subject, we can also arrange a private or on site course for you.

Books covering this topic
Yes. We have over 700 books in our library. Books covering PHP are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Sticky fields and session" training module. You'll find a description of the topic and some other closely related examples on the "Sticky fields and session" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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The Horse's mouth provides a daily tip or thought.
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• All of these resources can be searched through through our search engine
• And there's a global index here.

Web site author
This web site is written and maintained by Well House Consultants.

Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

Conditions of use
Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.

This program is copyright Well House Consultants Ltd. You are forbidden from using it for running your own training courses without our prior written permission. See our page on courseware provision for more details.

Any of our images within this code may NOT be reused on a public URL without our prior permission. For Bona Fide personal use, we will often grant you permission provided that you provide a link back. Commercial use on a website will incur a license fee for each image used - details on request.

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