Procedural to OOP

Posted on 16th Feb 2014 07:03 pm by admin

John Kleijn said that to avoid writing "crappy code", we should learn OOP and common OO principles. I've started reading OOP tutorials including the design patterns. And John is right, this is not an easy task. It's a shame because I'm finding it hard to absorb the tutorials.

Is it ok if I'll show you some of my procedural codes and you'll show me how to code some of its parts in OOP? I learn faster by playing with relevant codes. I hope it's ok with you guys.


Basically, all my php files look like this:
Code: ini_set('display_errors', 1);
error_reporting(E_ALL & ~E_NOTICE);

include("fxns.php");
define('TITLE', 'Page Title');
session_start();

if(isset($_SESSION['user_id'])) {
if (validate_user() == true) {
print_header(TITLE); // echos html codes
print_navs(); // echos html codes
//contents here
// calling more functions here
print_footer();
}
} else {
header('Location: login.php');
}

and my fxns.php would look like this:
Code: include("connect.php");

function validate_user() {
$sql = "SELECT uo.ip_address, uo.session_id, uo.user_agent, uo.activity
FROM users_online uo, users u
WHERE uo.user_id='$_SESSION[user_id]' AND uo.user_id=u.user_id";
$res = mysql_query($sql); $row = mysql_fetch_array($res);
$ip_address = $row[0];
$session_id = $row[1];
$user_agent = $row[2];
$activity = $row[3];

$res2 = mysql_query("SELECT config_value FROM config WHERE config_name='inactivity'");
$row2 = mysql_fetch_array($res2); $inactivity = $row2[0];

$res3 = mysql_query("SELECT locked, invalid_ip FROM users WHERE user_id='{$_SESSION[user_id]}'");
$row3 = mysql_fetch_array($res3); $locked = $row3[0]; $invalid_ip = $row3[1];

// verify user's IP address
if($ip_address != $_SERVER['REMOTE_ADDR']) {
show_invalid_ip($_SERVER['REMOTE_ADDR']); // echo some HTML
}
// verify if the the session id and user's session id are the same
elseif ($session_id != session_id()) {
show_invalid_sid(); // echo some HTML
}
// verify if the browser software is the same
elseif($user_agent != $_SERVER['HTTP_USER_AGENT']) {
show_invalid_user_agent(); // echo some HTML
}
// verify if the user is locked
elseif ($locked == 1) {
show_locked($invalid_ip); // echo some HTML
}
// verify if the user has been inactive for $inactivity mins
elseif( time() > ( $activity + ($inactivity * 60) ) ) {
show_s_expired($inactivity); // echo some HTML
} else {
update_user();
return true;
}
}

function update_user() {
$maxtime = time() - 1800;
mysql_query("UPDATE users_online SET refurl='{$_SERVER['HTTP_REFERER']}' WHERE user_id='$_SESSION[user_id]'");
mysql_query("UPDATE users_online SET activity='".time()."' WHERE user_id='$_SESSION[user_id]'");
mysql_query("DELETE FROM users_online WHERE activity < '$maxtime'");
}


Would you be kind to write some of its part in OOP? Thanks so much.

Your Answer:

Login to answer

Other forums

Effort Estimation Template for Steady State Support
Hi Everyone,

Is there any SAP provided template/format for system change and enhancements

Posting to another Site?
I have software that people install.
When they install it, is there a way to make it post their d

How can I get my program to read a larger array ??
Hi:

I have this program that reads from an array to do calculations. The array are just t

Multidimensional array problems in $_POST
I'm having trouble with a three-dimensional $_POST array. It starts as a two-dimensional array on th

When file included, REMOTE_ADDR is server's?
I have an index file that handles my site, basically index.php?page=ip will activate "require('

making web pages for accounts
Hello, I would like to make pages for accounts on my website im making (its not a real website..im j

Calander layout
Hi i know this sounds like a simple question but i cant find the answer to it anywhere i have added

How to file_get_contents when login required?
Hello!

I am trying to read data from a page that you have to be logged into to view, I am try

Baffled by Undefined Index in Simple Array: Please Help!
Hello. I have a form which posts an array to this script. However, I can't seem to access the values

PHP Tab Control
Hi All,

I would like to have PHP tab control with/without Javascript.

But I want to r