Source Code
Source code is the human-readable set of instructions written in a programming language. It is the primary artifact produced by developers and is later compiled, transpiled, or interpreted to produce an executable program.
Source code consists of .php files containing statements, expressions, class and function definitions, and HTML markup.
The term is also used in compound phrases such as open source and closed source.
Source code is distinct from bytecode, machine code, or other intermediate representations produced during compilation.