CodeIgniter_01

1.Installation

1.1 download and install Codeigniter
webpage

1.2 configuration

main configuration

1. Develop your app inside the app folder.
2. The public folder will be your public-facing document root.
3. Do not change anything inside the system folder!

CI4 has been already an application before and can be nested into the htdocs of XAMPP.

And there are TWO values necessarily modified.

1. app/Config/App.php => baseURL=?
2. app/Config/Database.php =>some info:username,password=?

Then the configuration of server:
apache2/conf/httpd.conf

LoadModule rewrite_module modules/mod_rewrite.so
//make it uncommented

htaccess

<Directory "/opt/lamp/apache2/htdocs">
    Options Indexes FollowSymLinks
    AllowOverride All
    Require all granted
</Directory>

if localhost/ci_project doesn’t work ,the solution below will be applied.
apache/phpini

(append)
extension = intl;

1.3 remove /public from URL

1. copy these two files : .htaccess && index.html in public folder to the project root folder.
2. modify the value of $pathsConfig to “FCPATH . ‘/app/Config/Paths.php’”;

URL without public folder can work!

2.composer installation

2.1 download XAMPP

2.2 download composer

a dependency manager of php

download link for composer

2.2.1 install composer like normal software

2.2.2 download codeigniter and create new project directory

command:

composer create-project codeigniter4/appstarter   project-name

2.3 configuration

• 2.3.1 A subtle problem

• A problem may be emerged due to a lack of internation implement;
  solution=> delete ; from ;extension=intl in /php/php.in

• 2.3.2 env file

(official description )
CodeIgniter makes it simple and painless to set Environment Variables by using a “dotenv” file. The term comes from the file name, which starts with a dot before the text “env”.
CodeIgniter expects .env to be at the root of your project alongside the system and app directories. There is a template file distributed with CodeIgniter that’s located at the project root named env (Notice there’s no dot (.) at the start?). It has a large collection of variables your project might use that have been assigned empty, dummy, or default values. You can use this file as a starting place for your application by either renaming the template to .env, or by making a copy of it named .env.
(Attention: add . before env)

There indeed are three important points emphasised here.

• CI_ENVIRONMENT = development (the original value is production)

• app.baseURL = ‘http://localhost/’

• mysql parameters group

  writable
  some modifiable files like session ,cache or files stored in the server.

  vendor

  public
  it’s like a entry of codeigniter ???set up running environment and launch the default index webpage.

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Reference:
1.[extremely recommend]
Alex Lancer —youtube