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Gant chart in PHP
Objects in PHP example from a Well House Consultants training course
More on Objects in PHP [link]

This example is described in the following article(s):
   • Planning a hotel refurb - an example of a Gant chart in PHP - [link]
   • Gant charts - drawing them with a PHP script - [link]

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

Source code: elligant.php Module: H108

# Define a class of task objects
# sample data line passed in to constructor:
# x114 Philips TVs 2006-09-25 14? 26" TVs

class task {
task($instring) {
$parts explode(" ",$instring);
$this->rawcode array_shift($parts);
$this->supplier array_shift($parts);
$this->brief array_shift($parts);
$this->date array_shift($parts);
$this->rawduration array_shift($parts);
$this->full implode(" ",$parts);

# Task id

$this->bulked $cp[1];
$this->code $cp[2];

# Task duration

if (eregi('^([[:digit:]]+)(\??)$',
$this->rawduration,$cp)) {
$this->lensure 1;
         if (
$cp[2] == "?"$this->lensure=0;
$this->duration $cp[1];
         if (
$this->duration <1) {
$this->duration 1; }
      } elseif (
$this->rawduration == "OA") {
$this->lensure = -2;
$this->duration 999;
      } else {
$this->lensure = -1;
$this->duration 0;

# Task end date - start and end dates supported
# also supports som etask dependencies e.g. "before_316"

if (eregi('^([[:digit:]]+)-([[:digit:]]+)-([[:digit:]]+)$',
$this->date,$cp)) {
$this->ends mktime(12,0,0,$cp[2],$cp[3],$cp[1]);
$this->starts $this->ends $this->duration 3600 24;
      } elseif (
$this->date,$cp)) {
$this->starts mktime(12,0,0,$cp[2],$cp[3],$cp[1]);
$this->ends $this->starts $this->duration 3600 24;
      } elseif (
eregi('^before_([[:digit:]]+)$'$this->date,$cp)) {
$this->ends $basket[$cp[1]]->getstarts();
$this->starts $this->ends $this->duration 3600 24;
      } elseif (
eregi('^after_([[:digit:]]+)$'$this->date,$cp)) {
$this->starts $basket[$cp[1]]->getends();
$this->ends $this->starts $this->duration 3600 24;
      } else {
$this->ends 0;
# end of class definition

function bystartdate($one,$two) {
   return (
$one->getstarts() - $two->getstarts());
dayform($unidate) {
date("D d M Y",$unidate);

################ Main code starts here

$source file("pps");
$basket = array();

# Read and analyse all tasks

foreach ($source as $task) {
# Strip out comments starting # in data
$task preg_replace("/#.*/","",$task);
   if (! 
ereg("[[:alnum:]]",$task)) continue;
$current = new task($task);
$key $current->getcode();

# Keep an associative array of task objects
$basket[$key] = $current;

$starts $current->getstarts();
$ends $current->getends();
$duration $current->getduration();
# print ("$key $starts $ends $duration\n");

# Put tasks into start date order


# Generate output display via a table of stretched images

$offbar "<img src=off.jpg height=12";
$offmonth "<img src=off2.jpg height=12";
$onbar "<img src=on.jpg height=12";
$inprogress "<img src=on2.jpg height=12";

$tgraph "<table border=0 cellpadding=0 cellspacing=0>";
$havetitle 0;

foreach (
$basket as $task) {
$from dayform($f $task->getstarts());
$to dayform($t $task->getends());
$code $task->getcode();
$supplier $task->getsupplier();
$brief $task->getbrief();
$lensure $task->getlensure();
$texted .= "$code - $from to $to by $supplier$brief $lensure\n<br>";

$now time();
$barname "";
$barline "";
$barlen 0;
   for (
$day=0$day<180$day++) {
$now += 3600*24;
      if (
$now $f or $now $t) {
$nextbar $offbar;
# Colour the first day of each month
if (date("d",$now) == 1$nextbar=$offmonth;
      } else {
$nextbar $onbar;
         if (
$lensure == -2$nextbar $inprogress;
      if (
$barname != $nextbar and $barname != "") {
$barline .= "$barname width=".(2*$barlen).">";
$barname $nextbar;
$barlen 2;
      } else {
$barname $nextbar;
$barlen += 2;
$barline .= "$barname width=".(2*$barlen).">";
# Add month titles above first line
if ($havetitle == 0) {
$tgraph .= "<tr><td>&nbsp;</td><td>";
$tgraph .= "<table border=0 cellpadding=0 cellspacing=0 width=100%><tr>";
      foreach (
array_keys($monlen) as $month) {
$pc sprintf("%d",$monlen[$month]*100/$nvals);
$tgraph .= "<th width=$pc%>$month</th>";
$tgraph .= "</tr></table></tr>";
$havetitle 1;
$tgraph .= "<tr><td>$code$supplier$brief</td>";
$tgraph .= "<td>$barline</td></tr>";

$tgraph .= "</table>";

# Generate the HTML page - change the following
# for a nice look and feel

<head><title>Gant chart - Well House Manor</title></head>
<body><h1>Timeline for suppliers and actions</h1>
<?= $tgraph ?><br>
Textual report:<br>
<?= $texted ?><br>
Copyright <?= date ("l dS F Y"?>

Learn about this subject
This module and example are covered on the following public courses:
 * Object Oriented Programming in PHP
 * PHP Programming
 * Learning to program in PHP
Also available on on site courses for larger groups

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 "Objects in PHP" training module. You'll find a description of the topic and some other closely related examples on the "Objects in PHP" 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.

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.

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

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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