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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Graphing server log files
Maps, Graphics and Geographics example from a Well House Consultants training course
More on Maps, Graphics and Geographics [link]

This example is described in the following article(s):
   • Server logs - drawing a graph of gathered data - [link]

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

Source code: serverlog.php Module: H309
# Create a graph of system loading data from server log files

# Start with a blank canvas, 820 x 500 pixels

$image ImageCreate(820,500);

# Choose your paint pallette

$black ImageColorAllocate($image,0,0,0);
$grey ImageColorAllocate($image,200,200,200);
$blue ImageColorAllocate($image,0,0,255);
$red ImageColorAllocate($image,255,0,0);
$green ImageColorAllocate($image,0,255,0);
$yellow ImageColorAllocate($image,255,255,0);
$orange ImageColorAllocate($image,255,128,0);
$white ImageColorAllocate($image,255,255,255);
# List of colours for each of the days
$cols = array($yellow$red$green$orange$black);

# Blue outline, Grey area for axes, White area for data


# Draw and label the axes

$load 3;
for (
$y1 150$y1 <= 350$y1 += 100) {

$hour 0;
for (
$x1 50$x1 <= 770$x1 += 30) {
        if (
$hour == 0) {
$hour ++;

# Add in a box for labelling each curve


# Title the graph and the axes

"Server loading on www.wellho.net");

Imagettftext($image,12,0,350,490,$black,"ArialBold.ttf""Time of day");
"Server Load (last 5 minutes average)");

# Find the most recent five data files to graph

$statfiles = array();
$dh opendir ("$_SERVER[DOCUMENT_ROOT]/../serverstatus");
while (
$item readdir($dh)) {
        if (! 
preg_match('/_statlog/',$item)) continue;
$week array_slice($statfiles,-5);

# Loop through adding each line to the graph

foreach (
$week as $daily) {
$col $cols[$n++];
$records file("$_SERVER[DOCUMENT_ROOT]/../serverstatus/$daily");

# Draw the line itself

$oldx = -1;
        foreach (
$records as $rec) {
$parts explode(" ",$rec);
$y $parts[13];
$x $oldx+1;
                if (
$oldx >= 0) { # Skip drawing to very first point
$y1 450.0 $oldy 100.0 ;
$y2 450.0 $y  100.0;
ImageLine($image,50+$oldx*2,$y1,50$x 2,$y2,$col);
$oldx $x;
$oldy $y;

# Annotate the line just added - the date is based on the file name

$dtext "$dp[3]/$dp[2]/$dp[1]";

$yax 150 15 $n;

#┬áTell the browser that it will be receiving a jpg image rather than HTML!
header("Content-type: image/jpeg");

# Convert the canvas into a .jpg image and output it


Learn about this subject
This module and example are covered on our public PHP Techniques course. If you have a group of three or more trainees who need to learn the subject, we can also arrange a private or on site course for you.

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 "Maps, Graphics and Geographics" training module. You'll find a description of the topic and some other closely related examples on the "Maps, Graphics and Geographics" 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.

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