Gant chart in PHP - PHP example

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]

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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

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