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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

include ("$_SERVER[DOCUMENT_ROOT]/../demoprivate/");
include (
include (

// Shell for general purpose session based application


// Set up for a newcomer!

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

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

$error 0;
switch (
$current) {

0// Finish up from initialisation
$current 1;

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]);

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

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

"Oh dear - bust!";

$_SESSION[current] = $current;

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

switch ($current) {

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

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

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");
$fields = array (
"note","Comment:",$_POST[note],$xnotesize => 50));
array_push ($fields,
"choice","Choice of image:",$_POST[choice],$xchoice,
type => "pulldown",
options => $options));
array_push ($fields,
"sqlchoice","Choice of book:",
type => "pulldown",
options => $titles));
$form makeform($fields);
$fill[doing] = "getting a thought";
$fill[result] = htmlspecialchars(
"You are $_SESSION[name] and voted $_SESSION[vote]")."<br>";

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);


"Oh dear - failed!";
######################### 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);

Learn about this subject

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 "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
• 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.

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