PHP is a widely used, high-level, dynamic, object-oriented and interpreted scripting language primarily designed for server-side web development.
For questions about scripts written for the Bash command shell. For shell scripts with errors, please check them with the shellcheck program (or in the web shellcheck server at https://shellcheck.net) before posting here. Questions about interactive use of Bash are more likely to be on-topic on Super User than on Stack Overflow.
Do not use this tag. For questions related to an aspect of the world wide web, use a more specific tag for it, such as [uri], [html], [http] or [w3c].
CodeIgniter is an open-source PHP web development framework created by EllisLab Inc and it has been adopted by British Columbia Institute of Technology. The framework implements a modified version of the Model-View-Controller design pattern. Use this tag for questions about CodeIgniter classes, methods, functions, syntax and use PHP web development framework created by EllisLab Inc and it has been adopted by British Columbia Institute of Technology.
ASP.NET is a Microsoft web application development framework that allows programmers to build dynamic web sites, web applications and web services. It is useful to use this tag in conjunction with the project type tag e.g. [asp.net-mvc], [asp.net-webforms], or [asp.net-web-api]. Do NOT use this tag for questions about ASP.NET Core - use [asp.net-core] instead.
CSS (Cascading Style Sheets) is a representation style sheet language used for describing the look and formatting of HTML (Hyper Text Markup Language), XML (Extensible Markup Language) documents and SVG elements including (but not limited to) colors, layout, fonts, and animations.
Use this tag (along with an appropriate programming-language tag) for programming questions relating to the Apache HTTP Server. Do not use this tag for questions about other Apache Foundation products. Note that server configuration questions are usually a better fit on https://serverfault.com
C is a general-purpose computer programming language used for operating systems, libraries, games and other high performance work. This tag should be used with general questions concerning the C language, as defined in the ISO 9899:2011 standard. If applicable, include a version-specific tag such as c99 or c90 for questions relating to older language standards. C is distinct from C++ and it should not be combined with the C++ tag absent a rational reason.
C# (pronounced "see sharp") is a high level, object-oriented programming language that is designed for building a variety of applications that run on the .NET Framework (or .NET Core). C# is simple, powerful, type-safe, and object-oriented.
A data structure is a way of organizing data in a fashion that allows particular properties of that data to be queried and/or updated efficiently.
Structured Query Language (SQL) is a language for querying databases. Questions should include code examples, table structure, sample data, and a tag for the DBMS implementation (e.g. MySQL, PostgreSQL, Oracle, MS SQL Server, IBM DB2, etc.) being used. If your question relates solely to a specific DBMS (uses specific extensions/features), use that DBMS's tag instead. Answers to questions tagged with SQL should use ISO/IEC standard SQL.