Which are recommended libraries and resources to use with PHP?

To successfully develop applications here are some recommended development libraries and resources you will like and can enrich experience.

• AJAX:
  • Backbone.js - Structure to web applications that involve JavaScript and data.
  • jQuery - Useful JavaScript library for easier AJAX, HTML document traversal and manipulation, event handling, animation etc.
• File upload:
  • Dropzone.js - Drag’n’drop file uploads.
• User interface:
  • Semantic UI - Framework that helps you create beautiful, responsive layouts using human-friendly HTML.