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Main demo script; uses sessions, functions, SQL, XML and XSLT
Designing PHP-Based Solutions: Best Practice example from a Well House Consultants training course
More on Designing PHP-Based Solutions: Best Practice [link]

This example is described in the following article(s):
   • Back button - ensuring order are not submitted twice (PHP) - [link]

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

Source code: sc6.php Module: H115
<?php

include ("$_SERVER[DOCUMENT_ROOT]/../demoprivate/stdsess.inc");
include (
"$_SERVER[DOCUMENT_ROOT]/../demoprivate/xsltdemo.inc");
include (
"$_SERVER[DOCUMENT_ROOT]/../demoprivate/sqldemo.inc");

// Shell for general purpose session based application

session_start();

// Set up for a newcomer!

if (! $_SESSION[current]) {
        
$current 0;
} else {
        
$current $_SESSION[current];
}

######################### Handler responses from previous form

$error 0;
switch (
$current) {

case 
0// Finish up from initialisation
        
$current 1;
        break;

case 
1// Finish up from name and email
        
$xname check_an_alpha("name");
        
$xemail check_an_email("email");
        if (! 
$error) {
                
$current 2;
                
$_SESSION[name] = $_POST[name];
                
$_SESSION[email] = trim($_POST[email]);
                }
        break;

case 
2// Finish up from vote
        
$xvval check_an_month("vval");
        if (! 
$error) {
                
$current 3;
                
$_SESSION[vote] = $_POST[vval];
                
$_SESSION[day] = $_POST[vday];
                }
        break;

case 
3// Finish up from comment
        
$comment $_POST[note] ;
        
$comment or $comment "No comment";
        
$imgwant $_POST[choice];
        
$bookwant $_POST[sqlchoice];
        
$current 4;
        break;

default:
        print 
"Oh dear - bust!";
        break;
}

$_SESSION[current] = $current;

######################### Prepare for next form

switch ($current) {

case 
1// prepare for name and email
        
$fields = array (
                array(
"name","Your name:",$_POST[name],$xname),
                array(
"email","Your email address:",$_POST[email],$xemail));
        
$form makeform($fields);
        
$fill[doing] = "identifying yourself";
        
$fill[result] = "-";
        break;

case 
2// prepare for vote
        
$fields = array (
                array(
"vval","Favourite month:",$_POST[vval],$xvval),
                array(
"vday","Favourite day:",$_POST[vday],$xvday,
                        
type => "pulldown",
                        
options => "Monday|Tuesday|Wednesday|".
                                
"Thursday|Friday|Saturday|Sunday"));
        
$form makeform($fields);
        
$fill[doing] = "Voting";
        
$fill[result] = "You are ".
                
htmlspecialchars($_SESSION[name])." from ".htmlspecialchars($_SESSION[email]);
        break;

case 
3// prepare for comment, image and author entry
        
$options extract_xml_data("imnames.xsl");
        
$options preg_replace('/<\?.*?\?>/',"",$options);
        
$options preg_replace('/\s+/',"",$options);
        
$titles =  do_sql("select isbn,title from books limit 20");
        
$fields = array (
                array(
"note","Comment:",$_POST[note],$xnotesize => 50));
        
array_push ($fields,
                array(
"choice","Choice of image:",$_POST[choice],$xchoice,
                        
type => "pulldown",
                        
options => $options));
        
array_push ($fields,
                array(
"sqlchoice","Choice of book:",
                        
$_POST[sqlchoice],$xsqlchoice,
                        
type => "pulldown",
                        
options => $titles));
        
$form makeform($fields);
        
$fill[doing] = "getting a thought";
        
$fill[result] = htmlspecialchars(
                
"You are $_SESSION[name] and voted $_SESSION[vote]")."<br>";
        break;

case 
4// prepare for thank you
        
$form "Thank you for your submission";
        
$fill[doing] = "being thankful";
        
$fill[result] =
                
"$_SESSION[name] from $_SESSION[email] i".
                
"voted $_SESSION[day] in $_SESSION[vote] and said $comment ".
                
"asked for $bookwant and chose $imgwant<br>";
        
$fill[result] .=
                
"Follow <a href=$_SERVER[PHP_SELF]>this link</a> to restart the demo";
        
// At this point, record the vote, send emails, etc!

        
$titles =  do_sql("select isbn,title,authorfull,pubdate from books".
                        
" where isbn = '$bookwant'");
        
$fill[result] .= "<hr>".join(", ",$titles[0])."<br>";
        
$fill[result] .= extract_xml_data("details.xsl",$imgwant);

        
session_destroy();
        break;

default:
        print 
"Oh dear - failed!";
        break;
}
######################### Send response

$fill[current] = $current;
$fill[errmsg] = $error "Error - please correct as indicated" "";
$fill[form] = $form;

$fh fopen ("demo.htp","r");
$html fread($fh,filesize("demo.htp"));

foreach (
array_keys($fill) as $k) {
        
$html preg_replace("/%$k%/",$fill[$k],$html);
}
print 
$html;
?>

Learn about this subject

Books covering this topic
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Other Examples
This example comes from our "Designing PHP-Based Solutions: Best Practice" training module. You'll find a description of the topic and some other closely related examples on the "Designing PHP-Based Solutions: Best Practice" 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
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This web site is written and maintained by Well House Consultants.

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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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