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Web2 and caching example from a Well House Consultants training course
More on Web2 and caching [link]

This example is described in the following article(s):
   • Using a cache for efficiency. Python and PHP examples - [link]

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Source code: train_graphic.php Module: H307
<?php

# Read in our place definitions
$xcp = array();
$ycp = array();
foreach (
file("tfdt.txt") as $places) {
        
$td trim($places);
        list(
$x$y$pld) = explode("; ",$td);
        
$xcp[$pld] = $x;
        
$ycp[$pld] = $y;
        }

# Cache - update every 10 minutes (max)
if (time()- filemtime("tfd.txt") > 600) {
        
$logrecs file("http://(url obscured)");
        
$fh fopen("tfd.txt","w");
        foreach (
$logrecs as $line) { fputs($fh,$line); }
        
fclose ($fh);
} else {
        
$logrecs file("tfd.txt");
}

# Read in base map, set up some colours
$image ImageCreatefromJpeg("osx2.jpg");

$grey ImageColorAllocate($image,150,150,150);
$blue ImageColorAllocate($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);

# Extract places mentioned
foreach ($logrecs as $logline) {
        list(
$date,$service,$detail) = explode("\t",$logline);

        
$col $grey;
        if (
eregi("cancel",$detail)) {
                if (! 
ereg("planned engin.*cancelled",$detail)){
                        
$col $red; }}
        if (
eregi("divert",$detail) or eregi("start",$detail)
                        or 
eregi("termina",$detail)) {
                        
$col $blue; }
        if (
eregi("revise",$detail) or eregi(" fast ",$detail)) {
                        if (
eregi("no longer",$detail)) {
                        
$col $green; }}
        if (
eregi("refresh",$detail) or
                        
eregi("buffet",$detail) or
                        
eregi("catering",$detail) or
                        
eregi("brasse",$detail)) {
                        
$col $yellow;
        } elseif (
eregi("carria",$detail) ) {
                        
$col $orange; }

        if (! 
ereg("^[012]",$service)) continue;
        if (
ereg('(.....).(.*) to (.*) due (.*)',$service,$bits)) {

# Are we thickening a line?
                
if ($bits[2] > $bits[3]) {
                        
$bt $bits[2];
                        
$bits[2] = $bits[3];
                        
$bits[3] = $bt;
                        }
                
$route "$bits[2] $bits[3]";
                
$offset $counter[$route]++;

                if (
abs($xcp[$bits[2]] - $xcp[$bits[3]]) >
                        
abs($ycp[$bits[2]] - $ycp[$bits[3]])) {
                        
$yoffset $offset;
                        
$xoffset 0;
                } else {
                        
$xoffset $offset;
                        
$yoffset 0;
                }

                
ImageLine($image,
                        
$xcp[$bits[2]]+$xoffset,$ycp[$bits[2]]+$yoffset,
                        
$xcp[$bits[3]]+$xoffset,$ycp[$bits[3]]+$yoffset,
                        
$col);
        }
}

# Flush map
header("content-type: image/jpeg");
ImageJpeg($image);

?>

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.

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Other Examples
This example comes from our "Web2 and caching" training module. You'll find a description of the topic and some other closely related examples on the "Web2 and caching" module index page.

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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.

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