CodeIgniter 4.3の処理の流れをまとめました。

CodeIgniter 4.3 Process Flow

public/index.php

check PHP version

define constant FCPATH

instantiate Config\Paths

• Config\Paths

  • $systemDirectory
  • $appDirectory
  • $writableDirectory
  • $testsDirectory
  • $viewDirectory

load system/bootstrap.php

• system/bootstrap.php

  • define constants for directory paths

    • APPPATH
    • ROOTPATH
    • SYSTEMPATH
    • WRITEPATH
    • TESTPATH

  • load Config/Constants.php

  • load Common.php
  • load Autoloader
  • load Services
  • instantiate Autoloader and initialize

  • autoload helpers

    • URL helper

  • load Composer autoloader

instantiate DotEnv and load .env file

instantiate CodeIgniter

• Services::codeigniter()

  • instantiate Config\App
  • CodeIgniter::__construct()

initialize CodeIgniter

• CodeIgniter::initialize()

  • detect Environment
  • load Environment bootstrap

  • set Exception/Error handler

    • Services::exceptions()->initialize()

  • check missing required PHP extensions

  • set default locale
  • set default timezone
  • initialize Kint

• CodeIgniter::setContext()

run CodeIgniter

• CodeIgniter::run()

  • instantiate Request

    • Services::createRequest()

    • Services::incomingrequest()

      • IncomingRequest::__construct()

        • detectURI()

          • update superglobals

            • update $_SERVER
            • update $_GET

          • update URI object

          • set path in Request

  • instantiate Response

  • force secure access
  • spoof request method
  • check Page Cache

  • handle request

    • CodeIgniter::handleRequest()

      • tryToRouteIt()

        • instantiate Routes
        • instantiate Router
        • get Controller and method name
        • set locale in Request
        • get Controller Filters

      • enable Controller Filters

      • run before Filters

      • run Controller

        • run Closure controller

        • or

          • instantiate Controller
          • run Controller method

      • gather output

      • run after Filters
      • send response
      • return Response object