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Log file analysis (1) - base case - functioning but poorly structured
Web2 and caching example from a Well House Consultants training course
More on Web2 and caching [link]

This example references the following resources:

Source code: a_timbershow.php Module: H307
<title>Log File Analyis</title>
<h1>Looking at yesterday's log file</h1>
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:
<font color=navy> - - [22/May/2009:03:30:08 +0100]
"GET /bing/images/WHClogoBW.jpg HTTP/1.1" 200 12344
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:
Gecko/2009042316 Firefox/3.0.10"</font>


# 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)){

        # For particular reports, do the work we will need

        if ($_REQUEST[report] == 1) {
                $shrapnel = explode(" ",$line);
                $ip_counter[$shrapnel[0]]++; }

        if ($_REQUEST[report] == 2) {
                $shrapnel = explode(" ",$line);
                $flakes = explode(":",$shrapnel[3]);
                $hour_counter[$flakes[1]]++; }

        if ($_REQUEST[report] == 3) {
                $shrapnel = explode(" ",$line);
                if (preg_match("@^/[-a-zA-Z0-9_]+/@",$shrapnel[6],$grabbed)) {
                } else {
                        $dir_counter["[top level]"]++;
                } }

# An example of the summary comments always given

print ("File is $lines lines long");

What Report would you like next?<br>
<a href=?report=1>Top 20 IP Address by number of visits</a><br>
<a href=?report=2>Hour by Hour</a><br>
<a href=?report=3>By Directory</a><br>

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

elseif ($_REQUEST[report] == 2) {
print ("Traffic levels through the day (and night!)<br>");
foreach (array_keys($hour_counter) as $thishour) {
        print ("$thishour ... $hour_counter[$thishour]<br>\n");

elseif ($_REQUEST[report] == 3) {
print ("How was traffic divided, directory by directory<br>");
foreach (array_keys($dir_counter) as $thisdir) {
        print ("$thisdir ... $dir_counter[$thisdir]<br>\n");

else {
print ("Your results will appear here<br>");


Copyright ... <?= date("Y") ?>
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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