CodeIgniter is a powerful PHP framework with a very small footprint, built for developers in this tutorial, please notify us at [email protected] CodeIgniter Tutorial in PDF - Learn CodeIgniter starting from Overview, Installing CodeIgniter, Application Architecture, MVC Framework, Basic Concepts. CodeIgniter tutorial, As we all know Codeigniter is a PHP Application Development based framework, a toolkit- for building websites using PHP. It is a simple.
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Increase security by hiding the location of your CodeIgniter files. 6 . You can share this PDF with anyone you feel could benefit from it, downloaded the latest. Codeigniter Tutorial Pdf For Beginners. This tutorial is intended to introduce you to the CodeIgniter framework and the Static pages, which will teach you the. CodeIgniter for Rapid PHP. Application Development. Improve your PHP coding productivity with the free compact open-source MVC CodeIgniter framework!.
Examples include the Database library, as databases are an essential part of any modern web application, and the URL helper function which can prove to be useful in loading URLs easily. In order to autoload the Database library, open the following file:. You can autoload additional libraries in the array method, separated by commas.
By getting to know more about MVC, we hope that you can further appreciate the many wonders of CodeIgniter. Okay, with the formalities out of the way, we can finally get to the meat of the tutorial.
At this point of our CodeIgniter tutorial, you should have a running distribution of CodeIgniter with the changes we made when configuring it in Step 2. You should also be familiar with how models, views, and controllers work in CodeIgniter. In this section, we will use that knowledge to create a simple CodeIgniter web application.
The app will be fairly simple in design: The controller will be used to route requests between the model and the view.
Once you get a grip on these fundamentals of CodeIgniter, you can go ahead and start building rich web applications. For our sample application, we need to create a single table titled reviews with 3 columns named id primary key and auto-incremented , title and grade. You should go ahead and create this table, as it will form the basis of our application.
CodeIgniter should have access to your database if you followed the instructions in Step 2. After creating the table, fill it with some mock values. After we have our database all sorted out, we can begin working on our business logic. To do this, we will create a model, which will get the values from the database.
Also note that the first letter of your class is uppercase — CodeIgniter requires all class names to begin with a capital letter. Now, you need to load the Database library that we talked about in Step 3. This will make working with databases a walk in the park. You can use the constructor method of the model, which will effectively load the library right from the start.
To do this, paste the following code inside the class created above:. Now, the database library has become visible to each method within the class.
Next up, we need to create another method which will use this database library to query the database:. The above method simply takes in ID as an argument and returns all the information in the columns associated with that ID.
So, this method will be called each time we request the review of a movie. We have taken care of our data retrieval layer.
We must now create a route so that when the user requests movie reviews, our yet-uncreated view is supplied with the information we just fetched using the model.
CodeIgniter controllers mandate that the file name is the same as the class defined inside that file.
After creating the file, open it, and paste the following code inside:. All we need to do now is to package the data retrieved from our model and pass it on to the view. To do this, we will create a method called show , which binds this data to a newly created structure and loads the view with that structure passed on to it. Note that the name of the file has to correspond to name you told the controller to load last line of the show method. Of course, you can add inline styling not recommended or reference a CSS stylesheet in the view.
Our sample application is complete. You should be able to run this application by entering the following in your browser:.
This will call the reviews controller that we created in Step 4. As a result, the user should now see the title and review the grade of the first movie in the database. The Email Helper provides some assistive functions for working with Email. The File Helper file contains functions that assist in working with files.
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The Form Helper file contains functions that assist in working with forms. The Inflector Helper file contains functions that permits you to change words to plural, singular, camel case, etc. The Language Helper file contains functions that assist in working with language files. The Number Helper file contains functions that help you work with numeric data. The Path Helper file contains functions that permits you to work with file paths on the server.
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The Security Helper file contains security related functions. The String Helper file contains functions that assist in working with strings. The Text Helper file contains functions that assist in working with text.
The Typography Helper file contains functions that help your format text in semantically relevant ways. The segments in a URI normally follow this pattern: your-domain. In some situations, you may want to change this default routing mechanism. CodeIgniter provides facility through which you can set your own routing rules.
Customize Routing Rules There is a particular file where you can handle all these. There are three reserved routes in CodeIgniter. You are encouraged to have a default route otherwise a page will appear, by default.
We can set home page of website here so it will be loaded by default. It will override the default error page.
This is required because the dash is not a valid class or method-name character and will cause a fatal error, if you try to use it.
Routes can be customized by wildcards or by using regular expressions but keep in mind that these customized rules for routing must come after the reserved rules. CodeIgniter — Configuration CodeIgniter After setting up the site, the next thing that we should do is to configure the site. Typically, this will be your base URL, with a trailing slash e. However, you should always configure this explicitly and never rely on autoguessing, especially in production environments.
Often we need to set up database for different environment like development and production. With the multidimensional array provided in the CodeIgniter, we can setup database for different environment. In order to keep the framework as light-weight as possible, only the absolute minimal resources are loaded by default.
One should autoload the frequently used system, rather than loading it at local level, repeatedly. Provide a list of libraries in an array as shown below to be autoloaded by CodeIgniter.
In this example, we are auto loading database, email and session libraries. They offer multiple interchangeable driver options. Following is an example to autoload cache drivers. To start the configuration process, you need to supply CodeIgniter with all the relevant information about your MySQL database. You can do this by altering the database.
For example, to connect to a database created on Hostinger, the configuration file should look like this. Moving on further in our CodeIgniter tutorial, you should now set up your domain name. To do this, open the config. Virtual Hosts are useful if you want to run multiple application using a single domain name. This can help if you have only a single VPS and multiple applications, productions or otherwise, running on top of it.
You can create virtual hosts using your Apache server. First off, you need to make sure your document root is synched with the installation directory of CodeIgniter. For the next change, some context is needed.
For the purposes of good development practices, we want to get rid of it altogether. If not, execute this line: a2enmod rewrite And restart your web server: sudo service apache2 restart Now, create the. As a result, your URLs will look squeaky clean. MVC is predominantly a web development architecture paradigm, which recommends that in any given application, the business logic needs to be decoupled with the presentation.
It divides the application into three functional parts: models, views, and controllers. Models do all the dirty work — they are responsible for dealing with your database, carrying out computations etc. In short, it is where your business logic is located.As the name suggests, it controls the whole application by URI.
Also note that the first letter of your class is uppercase — CodeIgniter requires all class names to begin with a capital letter. The Inflector Helper file contains functions that permits you to change words to plural, singular, camel case, etc.
If you are not sure how to do this, see this tutorial. He loves to develop all sorts of websites on WordPress and is in love with WooCommerce in particular. Modern web frameworks do all of this for you.