Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
Python and Tcl - public course schedule [here]
Private courses on your site - see [here]
Please ask about maintenance training for Perl, PHP, Lua, etc
 
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:
http://www.wellho.net/pix/lhs9_

Source code: p_fifth.php Module: H050
<?php

/*
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 (
"<tr><td>".htmlspecialchars($prompt).
        
"</td><td><input name=\"$boxname\" value=\"".
        
htmlspecialchars(stripslashes($_REQUEST[$boxname])).
        
"\" /></td></tr>");
        }
function 
hidden($boxname,$value) {
        return
        
"<input type=\"hidden\" name=\"$boxname\" value=\"$value\">" ;
        }

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

function 
checknumber($field,$msg,$lower 0$upper 0) {
        global 
$grumble;
        
$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 />";
        return 
$good;
        }

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

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

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

// -----------------------  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  ----------------
?>
<html>
<head>
<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;
}
-->
</style>
</head>
<body>
<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
("Density","density"?>
<?= hidden
("userid","777"?>
<?= submit
() ?>
</form></table></div>
</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 ?>
</div></td></tr></table>
</center>
</body>
</html>

Learn about this subject
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.

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 "this" training module. You'll find a description of the topic and some other closely related examples on the "this" 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.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• 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.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2019: Well House Manor • 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01225 708225 • FAX: 01225 793803 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/resources/ex.php4 • PAGE BUILT: Sun Jan 31 13:04:01 2016 • BUILD SYSTEM: WomanWithCat