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One page application - design and human interface MATTERS
this example from a Well House Consultants training course
More on this [link]

This example is described in the following article(s):
   • Not just a PHP program - a good web application - [link]

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

This example references the following resources:

Source code: p_fifth.php Module: H050

1. Code should be commented for programmer
2. Page should include instructions for the user
3. Forms should include a submit button, even if they
   only have a single input box which submits on "enter"
4. Code should echo user inputs
5. First page should not perform submission actions on nothing
6. Fields should usually be sticky
7. Data should be validated
8. Data should be secure against injection attacks
9. Common code should be grouped into functions
10. Generated HTML should conform to selected standard (XHTML?)
11. Program and design elements should be separated
12. Error messages should be good 'uns

// -----------------------  Standard constants  -------------

$copyyear date("Y");
$company "Well House Consultants";

// -----------------------  Standard functions  -------------

function inputbox($prompt,$boxname) {
        return (
"</td><td><input name=\"$boxname\" value=\"".
"\" /></td></tr>");
hidden($boxname,$value) {
"<input type=\"hidden\" name=\"$boxname\" value=\"$value\">" ;

submit() {
        return (
"<tr><td>&nbsp;</td><td><input type=\"submit\" /></td></tr>");

checknumber($field,$msg,$lower 0$upper 0) {
$good ;
        if (
$_REQUEST[$field] <= $lower and
$lower >= $upper$good 0;
        if (
$_REQUEST[$field] >= $upper and
$lower $upper$good 0;
        if (! 
is_numeric($_REQUEST[$field])) $good 0;
        if (
$good == 0$grumble .= "* <font color=\"red\">".
" <b>$msg</b></font><br />";

cook($in) {
        return (
htmlspecialchars(stripslashes($in))); }

// -----------------------  Business logic  -----------

function calctonnage () {
$tons $_REQUEST[height] * $_REQUEST[width] *
$_REQUEST[depth] * $_REQUEST[density];

// -----------------------  Main code ----------------

$ok 1;
$grumble "";
$llimg "c";

if (
$_REQUEST[userid] == "777") {
$ok *= checknumber("height",
"Height must be positive"0);
$ok *= checknumber("width",
"Width must be positive"0);
$ok *= checknumber("depth",
"Depth must be positive"0);
$ok *= checknumber("density",
"Density must be positive"0);
        if (
$ok == 1) {

$tonnage calctonnage();

$saying "That is good data input ....<br />";
$saying .= "<br />A Box ".cook($_REQUEST[height]).
" by ".cook($_REQUEST[width]).
" by ".cook($_REQUEST[depth]).
" density of  ".cook($_REQUEST[density]).
"<br /><b>has a weight of $tonnage</b><br /><br />";
$llimg floor($tonnage) % 10;

        } else {
$saying "<b><u>Please review these errors:</u></b>".
"<br />$grumble";
} else {
$saying "Please complete the form<br />";

// -----------------------  Look and feel  ----------------
<title>Simple PHP Form Demonstration</title>
<style type="text/css">
.title {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 24px;
        font-weight: bold;
        color: #883300;
        color: #441100;
        text-align: center;
.introline {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 18px;
        font-style: normal;
        font-weight: 800;
        color: #883300;
        color: #441100;
        text-align: center;
.nonitaltext {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        font-style: normal;
        color: #000000;
.ctext {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        font-style: normal;
        text-align: center;
        color: #000000;
.error {
        font-family: "Times New Roman", Times, serif;
        color: #FF0000;
        text-align: center;
<center><table width="640" bgcolor="#FFEEDD" cellpadding="15"><tr>
<td colspan="2" valign="top">
<div class="title">Calculate the weight of a cube</div></td>
<tr><td><div class="nonitaltext">
<?= $saying ?><br>
<table class="nonitaltext"><form method="POST">
<?= inputbox("How tall","height"?>
<?= inputbox
("How Wide","width"?>
<?= inputbox
("How Deep","depth"?>
<?= inputbox
<?= hidden
<?= submit
() ?>
</td><td valign="top"><div class="ctext">
<img src="http://www.wellho.net/pix/lhs9_<?= $llimg ?>.jpg"
hspace="5"><br clear=all>
A demonstration page from a PHP course</div></td></tr>
<tr><td colspan="2"><div class="introline">
Copyright <?= $company ?><?= $copyyear ?>

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This module and example are covered as required on private courses. Should you wish to cover this example and associated subjects, and you're attending a public course to cover other topics with us, please see our extra topic program.

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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.

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