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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
<?php

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

class task {
   var 
$rawcode;
   var 
$code;
   var 
$supplier;
   var 
$brief;
   var 
$date;
   var 
$rawduration;
   var 
$duration;
   var 
$lensure;
   var 
$full;
   var 
$ends;
   var 
$starts;
   var 
$bulked;
   function 
task($instring) {
      global 
$basket;
      
$parts explode(" ",$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

      
eregi("^([[:alpha:]]*)([[:digit:]]+)",$this->rawcode,$cp);
      
$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 $this->duration 3600 24;
      } elseif (
eregi('^start_([[:digit:]]+)-([[:digit:]]+)-([[:digit:]]+)$',
         
$this->date,$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;
      }
   }
   function 
getcode(){
      return 
$this->code;
      }
   function 
getends(){
      return 
$this->ends;
      }
   function 
getstarts(){
      return 
$this->starts;
      }
   function 
getduration(){
      return 
$this->duration;
      }
   function 
getsupplier(){
      return 
$this->supplier;
      }
   function 
getbrief(){
      return 
$this->brief;
      }
   function 
getlensure(){
      return 
$this->lensure;
      }
   }  
# end of class definition

function bystartdate($one,$two) {
   return (
$one->getstarts() - $two->getstarts());
   }
function 
dayform($unidate) {
   return 
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

uasort($basket,bystartdate);

# 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;
      
$monlen[date("M",$now)]++;
      
$nvals++;
      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
?>

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

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
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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
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