Log file analysis (2) - code optimised for readability

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

This example references the following resources:
http://www.wellho.net/resources/ex.php4?item=j714/Strtok.java

Source code: a_logshow.php Module: H307

<?php
# All the PHP at the top ....................

# Code to analyse the log file
# ----------------------------

$ip_counter = array();
$hour_counter = array();
$dir_counter = array();

# We will always read the log file, as we need to give some
# basic stats every time the page is called up

$fh = fopen ("ac_20090522","r");
while ($line = fgets($fh,4096)){
 $lines++;

 # For particular reports, do the work we will need

switch ($_REQUEST[report]) {
 case 1:
 $shrapnel = explode(" ",$line);
 $ip_counter[$shrapnel[0]]++;
 break;
 case 2:
 $shrapnel = explode(" ",$line);
 $flakes = explode(":",$shrapnel[3]);
 $hour_counter[$flakes[1]]++;
 break;
 case 3:
 $shrapnel = explode(" ",$line);
 if (preg_match("@^/[-a-zA-Z0-9_]+/@",$shrapnel[6],$grabbed)) {
 $dir_counter[$grabbed[0]]++;
 } else {
 $dir_counter["[top level]"]++;}
 break;
 default:
 break;
 }

}

# An example of the summary comments always given

$headline = "File is $lines lines long";

# Generate the result string here

$result = "";

switch ($_REQUEST[report]) {
 case 1:
 $result .= "IP addresses of clients who visited us the most ";
 arsort($ip_counter);
 $cutoff = 20;
 foreach (array_keys($ip_counter) as $current_ip) {
 if (++$shown > $cutoff) break;
 $result .= "$shown: $current_ip ... $ip_counter[$current_ip] \n";
 }
 break;

 case 2:
 $result .= "Traffic levels through the day (and night!) ";
 foreach (array_keys($hour_counter) as $thishour) {
 $result .= "$thishour ... $hour_counter[$thishour] \n";
 }
 break;

 case 3:
 $result .= "How was traffic divided, directory by directory ";
 ksort($dir_counter);
 foreach (array_keys($dir_counter) as $thisdir) {
 $result .= "$thisdir ... $dir_counter[$thisdir] \n";
 }
 break;

 default:
 $result .= "Your results will appear here ";
 break;
}

# ***********************************************************
# Now the HTML with placeholders for PHP variables to display
?>
<html>
<head>
<title>Log File Analyis - Improved</title>
</head>
<body>
<h1>Looking at yesterday's log file</h1>
N.B. Second demonstration - code re-arranged to make it a bit more
efficient and a bit more maintainable
 
This is a demonstration of the analysis of a text file and selection of
data from it for display on a web page. The sample file we have used as
our data source is a web access log file of some 30 Mbytes, with over
100,000 records each of which looks something like:
 
208.102.246.149 - - [22/May/2009:03:30:08 +0100]
"GET /bing/images/WHClogoBW.jpg HTTP/1.1" 200 12344
"http://www.wellho.net/resources/ex.php4?item=j714/Strtok.java"
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10)
Gecko/2009042316 Firefox/3.0.10"
 
<?= $headline ?>
<hr>
What Report would you like next? 
<a href=?report=1>Top 20 IP Address by number of visits</a> 
<a href=?report=2>Hour by Hour</a> 
<a href=?report=3>By Directory</a> 
 
Results: 
 
<?= $result ?>
 
Copyright ... <?= date("Y") ?>
</body>
</html>

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