Requirements:

• LAMP stack installed, you know… Apache 2, PHP
• Build essentials (gcc compilers and all the hoard )
• A Linux distribution (mine is Ubuntu  11.something)
• 1 beer & nothing beater to do 

OK so the fist thing that you have to do is to install the build essentials by running the command :

sudo apt-get install build-essential

Be proud ! and tell to all you’re friends ! you are a linux developer ’cause you have a compiler running on you PC. Now that you can compile c/c++ files you will need the OpenCV library. There are two ways to install it: that first is to download the latest version from http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.2/ and run make and make-install commands (not recommended, there is always a missing library or a stupid error ) or you just can open System->Administration->Synaptic package manager search opencv and check all the libraries as in the following image:

OpenCv library is installed but… hold on, do not touch you’re beer yet ! you still have to download and compile facedetection library, do that by using the following magic incantation :

wget http://www.xarg.org/download/facedetect-1.0.1.tar.gz
tar -xvf facedetect-1.0.1.tar.gz
cd facedetect
phpize
configure
make
make-install

Congratulation !! you parents should be so proud of  you, now is the first time when you have compiled a module for PHP. The facedetect.so was created and copied to the corresponding PHP lib directory (/usr/lib/PPH5), add extension=facedetect.so to the php.ini file ( in  /etc/php5/apache2/php.ini or a similar location) restart the apache, now if you run phpinfo you should see the facedetect module up and running:

Now let’s create a PHP file ( for e.g. face.php)  with the following content:

<?php

function LoadJpeg($img) {
$im = @imagecreatefromjpeg($img);
if (!$im) {

echo ‘Bad image’;
}

$total = face_count($_GET['file'], ‘haarcascade_frontalface_alt.xml’);
$rectangles = face_detect($_GET['file'], ‘haarcascade_frontalface_alt.xml’);

$im = LoadJpeg($_GET['file']);
$pink = imagecolorallocate($im, 255, 105, 180);

if (count($rectangles) > 0) {

foreach ($rectangles as $arr) {
imagerectangle($im, $arr['x'], $arr['y'], $arr['x'] + $arr['w'],
$arr['y'] + $arr['h'], $pink);
}
}
header(‘Content-Type: image/jpeg’);
imagejpeg($im);
imagedestroy($im);

now run it in the browser http://localhost/face.php?file=lena.jpg and voala !!! you have detected the face of Lenna (still have to test it on fill version of Lenna ) .

While you are enjoying you’re beer just add few words as feed back in section belowww.

Therefore  other affordable technology like PHP are commonly wide used by most common users. In comparison with Java  or C#,  PHP language is pretty simple and doesn’t relay on so much formalism and doesn’t need a lot of knowledge about programming, allowing users to create application without knowing much think about programming technique.

The side effect is that the applications developed in this way are extremely hard to debug and even more harder to extend from a very wide variety of factors, some I will discuss later in this paper.

1. The first think to speak about  is the “spaghetti code” where the entire application logic (code) is meshed up in same file, you know what I am talking about: a lot of  if/else/for/while and functions with no logic organization.  To extend such crap application wrote by some other programmers is quite hard and unproductive.
2. Since version 4 PHP offers OOP(object orientated programming) but it seams that most of users doesn’t know how to use it right, how to increase their productivity using OOP programming technique and software engineering technique .It seams that web programmers are still writing code like in the stone age.
3. Another problem, the biggest one is that users are creating applications dependent on design. The design of a web site is changing frequently that means restructuring the code again and again and again.

The list is still open. I will continue to add more and more bad programming technique.