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In this tutorial, we are going to look at how you can install and configure CodeIgniter. They are two ways of installation CodeIgniter. You can download the latest version from the CodeIgniter website, or you can use a tool like a composer to automate the installation
In this tutorial, you will learn:
How to Download and Install CodeIgniter FrameworkThe source code for the CodeIgniter Framework is available on the official CodeIgniter website. If you want to download the latest version of the framework, then you should do it from the official web page.
The image below shows the download link to the latest version of the framework
Let’s say you want to create a project called the online store. You can follow the following steps to start your project. Create a new directory on your development drive, e.g, D:Sitesonline-store
Now, you should be able to see the following files. Copy the above contents to your project directory, e.g., D:Sitesonline-store
Start the built-in PHP server, just to make sure everything is OK.
cd D:Sites online-storeRun the following command
php -S localhost:3000If you see above image, all is working well,
What is Composer in CodeIgniter?
The Composer in CodeIgniter is a package management system for PHP. A package is simply a collection of PHP scripts that work together towards a single goal. Based on this definition, CodeIgniter can even though it’s a framework, qualifies to be labeled a package in composer terminologies.
Composer in CodeIgniter
The author of CodeIgniter hosts the package at Packagist which is a central repository for PHP packages, etc.
Install individual packages such as third-party email or database library
Update existing packages
Remove installed packages
How to Download & Install ComposerHere are the steps to download & install Composer in CodeIgniter:
Download the setup and follow the installation instructions.
Step 2) Open the command prompt/terminal
Run the following command
composerYou will see the following results
If you can see the above results, then congratulations, you have successfully installed the composer.
Let’s now create a new project called online-store
Run the following command
composer create-project CodeIgniter/framework online-storeHERE,
You should be able to see results that is similar to the following
If you are a big fan of commands on the terminal then this is the way to go otherwise you can use the good old fashioned download the zipped file, unzip and happy coding.
CodeIgniter Config FilesNow that we have successfully installed CodeIgniter let’s look at the configuration directory
The configuration directory is located in
application/configHERE,
chúng tôi – specifies the helpers, libraries, drivers, packages, etc that should be loaded when the application starts
chúng tôi – contains application configurations such as base url, language, query strings, etc.
chúng tôi – as the name suggests, this file I used to define application constants
chúng tôi – contains database connection parameters
chúng tôi – defines document types i.e. html4, html5, sv10 etc
foreign_chars.php – defines foreign characters that are to say characters that are found in languages such as Russian and others
chúng tôi – allows you to define your own hooks
chúng tôi – if you are using CodeIgniter together with Memcached then you can use this file for configurations.
chúng tôi – if you want to use database migrations in CodeIgniter then you can use this file to config the settings.
chúng tôi – contains file mime types
chúng tôi – contains settings that are used by the built-in CodeIgniter compiler
chúng tôi – contains the application routes
chúng tôi – contains settings for smileys
user_agents.php – contains settings for browser user agents, i.e., Chrome, Opera, Firefox, etc.
CodeIgniter ConfigurationsLet’s now make some of the most common settings in CodeIgniter:
Open application/config/config.php Base URL $config['base_url'] = '';Sets the base URL. If its blank then CodeIgniter will set it for you automatically. If you want to be explicit about your base URL, then you can use the something like the following
HERE,
Class Prefix
CodeIgniter uses the prefix CI_Classname. As a best practice and to avoid collisions with internal classes, you can prefix your class, i.e., MY_Classname. The following line is used to set your class prefix
$config['subclass_prefix'] = 'MY_'; Query StringsThese are parameters that are visited in the URL, i.e., chúng tôi If you would like to use such URLs, then you will have to set
$config['enable_query_strings'] = FALSE; To $config['enable_query_strings'] = TRUE; Other settingsThey are many settings that you can set in chúng tôi including date formats, cache and view paths, etc. much of what you configure depends on your application needs
How to remove chúng tôi in CodeIgniterThe URL looks longer and weird. The good thing is you can configure CodeIgniter to remove that.
Open application/config/config.php
Locate the following line:
$config['index_page'] = 'index.php'; Set it to the following $config['index_page'] = '';HERE,
We are using mod_rewrite to remove the page so as per requirement, this should be set to blank.
Next, we need to create the .htaccess that rewrites the URLs
Add a new file .htacces in the root directory of the application
Add the following code:
RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ chúng tôi [L,QSA]HERE,
The above code is for configuring web servers that run apache server. The above code basically gets the URI parameters and executes them via chúng tôi even if it’s not showing in the browser URL.
Summary
They are two ways of installation CodeIgniter. You can download the latest version from the CodeIgniter website, or you can use composer to automate the installation.
The composer is a package management system for PHP.
A composer can be used for: Install individual packages, Update existing packages remove installed packages.
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