A process of setting or re-setting the value stored in the storage location(s) denoted by a variable name.

The first version of symfony, a full stack MVC framework for PHP 5.

Widget that enables users of Facebook to "Like" websites, photos, objects, posts, etc.

GeoJSON is an open format, based on JSON, for encoding geographic data.

Xcode 5 is Apple's integrated development environment (IDE). Xcode 5.0 included the SDKs for Mac OS X 10.8 and iOS 7. *Do not use this tag unless your question specifically involves the Xcode IDE!*

A subclass is a class that derives or inherits from a parent (or super) class. Subclassing is used extensively in object-oriented programming (OOP).

GENERAL RPI QUESTIONS ARE OFF-TOPIC. General questions may be asked on https://raspberrypi.stackexchange.com Use the tag for questions that apply specifically to the Raspberry Pi Model 3, NOT other models.

A sparse matrix is a data structure in which not every entry is explicitly represented. Related are sparse matrix algorithms and data structures, along with questions about implementation and analyses.

Puppet is a ruby-based Configuration Management system incorporating a model-driven DSL. Its purpose is to provide configuration file enforcement, service state monitoring, package installation and other server-side management.

Bundler is a tool that makes it easier to keep track of what Ruby gems (and what versions of those gems) an application depends upon. It does so by installing all the gems in your application’s Gemfile. Bundler itself is a gem and can be installed with the following: $ gem install bundler

Symfony is a PHP framework developed by SensioLabs. Symfony 4 was released in November 2017.