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CodeIgniter

CodeIgniter is a powerful PHP framework with a very small footprint, built for developers who need a simple and elegant toolkit to create full-featured web applications. CodeIgniter was created by EllisLab, and is now a project of the British Columbia Institute of Technology.

Features

  • Model-View-Controller Based System
  • Extremely Light Weight
  • Full Featured database classes with support for several platforms.
  • Query Builder Database Support
  • Form and Data Validation
  • Security and XSS Filtering
  • Session Management
  • Email Sending Class. Supports Attachments, HTML/Text email, multiple protocols (sendmail, SMTP, and Mail) and more.
  • Image Manipulation Library (cropping, resizing, rotating, etc.). Supports GD, ImageMagick, and NetPBM
  • File Uploading Class
  • FTP Class
  • Localization
  • Pagination
  • Data Encryption
  • Benchmarking
  • Full Page Caching
  • Error Logging
  • Application Profiling
  • Calendaring Class
  • User Agent Class
  • Zip Encoding Class
  • Template Engine Class
  • Trackback Class
  • XML-RPC Library
  • Unit Testing Class
  • Search-engine Friendly URLs
  • Flexible URI Routing
  • Support for Hooks and Class Extensions
  • Large library of "helper" functions

https://www.tutorialspoint.com/codeigniter/codeigniter_overview.htm

Docker Environment

https://hub.docker.com/r/bitnami/codeigniter

Docs

Overview & General Topics

Request Handling

Handling Databases

Libraries & Helpers

Advanced Topics

https://codeigniter.com/user_guide/index.html