CodeIgniter From Scratch: Day 1

Jeffrey Way on Jul 14th 2009 with 633 comments

This entry is part 1 of 17 in the CodeIgniter From Scratch Session
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After numerous requests, today we are launching a new screencast series on Nettuts+ that will focus exclusively on the CodeIgniter PHP framework. Over the course of about 10 videos, I’ll teach you exactly how to use this framework. Ultimately, we’ll work our way up to building a custom CMS. Without further ado, here’s day one!

Day 1

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By Jeffrey Way

Rollover to read this author's bio or click through to see a full list of posts by this author.

I'm the editor of Nettuts+, and love making the process of building for the web as easy as possible. Also, I'm finishing up my latest book on Laravel Testing! If you want be friends, say hi on Twitter.

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reticent
thank you so much for tutorials ;)
Icetea
This collection isnt working… I cant open the videos… the flash cant load the content. Anyone can help me?

luis
hi! I opened the videos usually, can be a problem with your flash.

Ben
Thanks Jeffrey this is a great tutorial.
For anyone that is following this with the latest CodeIgniter (as of this writing version 2.1.2), you will have to extend CI_Controller and CI_Model instead of just Controller and Model. Also in the database.php file in the config folder make sure to set $db[‘default’][‘db_debug’] = false. Lost about two hours chasing these bugs down. Hope this helps.

Nadav
Really really helps. Thank you.
http://www.valodustudija.lv Roberts
Thanks, helped to solve my misunderstanding ;)
http://jsdecena.me Jeff
Cool! I was also puzzled why I get error 500 creating a controller. Thanks for reminding! ^^
Opeyemi
I actually followed the tutorial and appended ‘CI_’ to the controller and the model, but i could only display the last or second title of the ‘test’ table. if I use this code ”
< ? php foreach($records as $row){
echo $row-> title; }
? >
”
It displays the two titles on a single row(i mean side by side).
http://twitter.com/horsebones Leke
This is where youtube’s automations would come in handy.
Richard Steve
Thanks friend, I appreciate it !!!

http://www.web-plus.cz Jiri
Great tutorial.
@Ben Thanks for your comment, it saved me some time. I also had to set in autoload.php this to load the DB library $autoload['libraries'] = array(‘database’);
Jacob
Hey @ben, thanks for your comment, that saved me some time as well!
Can you just explain why I had to make this change:
$db[‘default’][‘db_debug’] = false;
What does setting that to false do?
http://www.siyastoan.com Stoan
Hey, The video doesn’t load on the page? can we get a different url if possible or any other help? Thank you
Roberto
Wow, great tutorial! From this one tutorial, I already understand the concept of Code Igniter.
Thank you!
saniya
great tutorial for the beginners like me.. thank u so much jeffery..
Eyal
Excellent tutorial! Thank you a bunch!
Two small suggestions:
1. Close all other programs prior to recording a lesson.
2. Decide on var names beforehand (especially pages, tables).
Thanks again and I am on my way to the next lesson! :-)
Opeyemi
Thank you so much for this video. I have a problem please, i followed your examples but can only display the last title in my database. It only displayed the last title when i removed this ,It gave this error when it was there.
” A PHP Error was encountered
Severity: Notice
Message: Use of undefined constant t_endforeach – assumed ‘t_endforeach’
Filename: views/home.php
Line Number: 15″.
Thanks for your time.

Opeyemi
I actually followed the tutorial and appended ‘CI_’ to the controller and the model, but i could only display the last or second title of the ‘test’ table.
if I use this code below
”
< ? php foreach($records as $row){
echo $row-> title; }
? > ”
It will display the two titles on a single row(i mean side by side)
Kindly help please. Thanks.

Prasann
Getting error in common.php
Deprecated: Assigning the return value of new by reference is deprecated in C:\xampp\htdocs\ci\system\codeigniter\Common.php on line 130
Deprecated: Assigning the return value of new by reference is deprecated in C:\xampp\htdocs\ci\system\codeigniter\Common.php on line 136
A PHP Error was encountered
Severity: 8192
Message: Function set_magic_quotes_runtime() is deprecated
Filename: codeigniter/CodeIgniter.php
Line Number: 60
http://www.codesamurai.de Carlos Bolanos
such a melancholy, with this screencasts i learned to writte code, and still follow Jeffrey Way, through the years, dude!! you have created jobs for so many people, you must be proud!
well at least me xD
JW
Just wanted to give you a kudos for the tutorials! You explained every bit and piece and what each does which really helps a newbie. Sometimes videos tell you to type something but doesn’t explain what each word (code) does. Some people need to learn the literal use in laymen terms. You did an awesome job making it easy for anyone to understand. Thanks Again!
Arc
Nice tutorial … thank you very much .. :)
http://www.targetweb.gr Peter
Thanks for this great tutorial! Jeffrey, you definitely are the best.
darren
please help
i have added the site_model.php and altered the site.php as per turtorial but am getting an error:
A PHP Error was encountered
Severity: Notice
Message: Undefined property: Site::$db
Filename: core/Model.php
Line Number: 51
Fatal error: Call to a member function get() on a non-object in /Applications/MAMP/htdocs/CodeI/application/models/site_model.php on line 7
I have configured the autoload.php and the database.php files. any ideas?
code for site.php
load->database(‘ci_series’);
$this->load->model(‘site_model’);
$data['records']=$this->site_model->getAll();// create new data array which stores the called method getAll
$this->load->View(‘home’);// loads view( the web page, passing it the data array
}
}
?>
db->get(‘test’); // connect to db select all in test
if ($q->num_rows > 0){
foreach ($q->result() as $row){ // for each store in $q as$row
$data[] = $row;
}
return $data;
}
}
}
?>
thanks
Dave
Hi,
so I’m doing the tutorial and I typed this into the controller:
function index() {
$data['myValue'] = “some string”;
$this->load->view(‘home’);
}
and then I put in this into the views page:
but I get the following error:
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: myValue
Filename: views/home.php
Line Number: 10
Dave
Hi,
sorry I’ll try that again:
so I’m doing the tutorial and I typed this into the controller:
function index() {
$data['myValue'] = “some string”;
$this->load->view(‘home’);
}
and then I put in this into the views page:
<php echo $myValue; >
but I get the following error:
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: myValue
Filename: views/home.php
Line Number: 10

i3oges
you are not passing $data into your load->view(),
it should be $this->load->view(‘home’, $data);

Dave
SORRY,
I’ve just seen my mistake, I forgot to add , $data
Gaurav Kanojiya
Hi….
I am in some trouble here.
I followed your video but still at the end i am getting database connection error. I have gone through several posts regarding this error and even tried the fixes mentioned there. But the error remains there. So its a request from my side, if u have little time to go through my code then I will paste that here. I am not able to try other videos of your awesome tutorial on whole internet. Pleaseeee :(

Gaurav Kanojiya
Ok….by mistake i have written database password to ‘root’, but i hv not given any password to it. but now I am getting a blank screen….why is it so?????

Peter
Awesome tutorial, thanks!!
nagender
Thank you very much ,i understood clearlly.
Arka
Awesome tutorial…Thank you very much…
Anthony Bliss
Spent 4 hours hitting my head against a wall trying to do this exact thing before finding this video! Life saver.
Now going to stay up the rest of the night watching the rest <3
One issue I have is that the videos are not iPad friendly, I wanted to use that as the video screen whilst I code!
Niels V
Wow man, thanks great beginner tutorial.
http://twitter.com/aldrenterante AldrenRealesTerante
Awesome! Thanks!
http://www.facebook.com/profile.php?id=100004166224922 Omar Abdirahman
Exactly what I needed to understand CodeIgniter. Thank you Jeffrey
Kennedy KK
Awesome. Only had to do a few changes since am using v2.1.2. Thanks.
aper
Nice tut, i searched houres for this.
But, can you please do a new CI tutorial using CI 2.1.3?
I think many people would appreciate that.

http://www.gamefans.com/ Jeremy Davis
I certainly would
http://twitter.com/horsebones Leke
I’m new to CI. Is there a big difference between the latest version and 1.7?

Infoget
Constructor is also changed:
function __construct()
{
parent::__construct();
$this->load->model(‘SOME_VALUE’);
….
}

Nasik Mohammed
Great Tuitorial
sivahari
Great Tut thus far, works well even for ci version 2.1.3
the only difference so far is when creating the Controller and Model classes which needs the CI_ prefix after extends
Ehsan
Thank You .. it was great introduction
Sharif
Great tutorial
munz
man i loooooooooooooooooooooooooove uuuuuuuuuuuuuuuuuuuuuuuuuuu
Carol
Hello ,Actually it’s my first time to learn codeigniter , now I’m facing a problem at 6.37 min in your video I am trying to open http://localhost/ci/index.php/site but it gives me
404 Page Not Found ! what’s the problem! Thanks in advance

christy
try this instead: http://localhost:8888/ci/index.php/site

Carol
Actually I found the solution by replacing Controller to CI_Controller , Model to CI_Model :) as I have downloaded the latest version of codeIgniter , Thanks for the great tutorial :)
derrick
i also could not open the base url . In eclipse, when i run after editing site.php to print hello world, nothing opens in the browser . I manually typed http://localhost/ci/index.php/site and it did not work either.

rajib123i
hello there. i m new here. i have download the source code. but i did not found any .sql file or any other database to import. thanks.
http://www.facebook.com/rengarajan.g Rengarajan Gopalakrishnan
How to connect more than 2 DB with CI?
ecko
This tut is brilliant, why? Because you do really know how to explain things, and that’s why I am sure I will learn something. Thank you
Shadi
About Removing The Index.php from the url when you are working on multiple projects which use Rewrite_mod it may do a conflict so easy copy the .htaccess into Code Igniter folder And Write this
# Do not remove this line, otherwise mod_rewrite rules will stop working Just this
RewriteBase /CodeIgniter_2.1.3(Or What Ever You call the File)/
RewriteEngine on
# Hide the application and system directories by redirecting the request to index.php or you can use the rules provided in the tutorial
RewriteRule ^(application|system|.svn) index.php/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [QSA,L]
Dinishika
This is a great beginning..thank you
imran
nice tutorial
Parag
thanks alot
rambideunt
thanks for the tutorials. really useful for a first timer like me
Pratik Sawant
Awesome tutorial, great way to start learning codeigniter, i loved it
tenpin
hi my name is Andy Tierney I’m from the UK i’m 46 and new to codeighter it is being used as part of a modal assignment for uni
i have a little under standing of what u are saying but u are using a mac i think so u are using a program called mamp pro what is this is this an equivalent to file zila a file transfer or is there some thing better out there for windows that is free iand would be better out there to use please could you help my email is sensi0007@yahoo.co.uk
i’d like to say that the vidio i have seen so far would be very useful
many thanks andy tierney
http://www.facebook.com/Sagar.S.Shinde Sagar Subhash Shinde
Awesome Tutorial.
Thanks a lot for this. I have been working on Core php and wanted someone to teach me CI.
Thumbs Up
Fatma
i have problem can someone help me ? i run appserv then i put my files in this path
C:AppServwww/ci
then i call my files bu use this url
localhost/index.php/site
but there is error
Not Found
The requested URL /index.php/site was not found on this server.
Apache/2.2.8 (Win32) PHP/5.2.6 Server at localhost Port 80
how can i solve this?
vinit
thanks sir…..
session was nice…..
Maede
very good, and complete tutorial. It was what I wanted and searched! thank you very much!
FoxtrotSierra
I’m having an issue right away. FYI, I am new to CI and PHP… I may be a lost cause. I have my documents in the website cloud.(dreamhost)
I am able to manipulate them using Aptana.
So here is the issue.(Please forgive me) Literally starting out using “site.php” I’m having an issue where “Controller” is not being recognized by Aptana.
Here is what I have.
<?php
class Site extends Controller {
function index() {
echo "hello world";
}
}
Here is what I get.|:
Fatal error: Class 'Controller' not found in /home/etaladmin/cedarcreekradio.com/application/controllers/Site.php on line 2
I've changed the Controller file permissions but still no luck.
Any thoughts?
Thank you!