How can different programming languages be consolidated within a single runtime environment?

Different programming languages can be consolidated within a single runtime environment by using a language-agnostic runtime such as the Java Virtual Machine (JVM) or the Common Language Runtime (CLR) in the .NET framework. These runtimes provide a common platform for running code written in different languages by compiling them into a common intermediate language (IL) or bytecode. This allows developers to write different parts of their application in different languages and still run them together seamlessly within the same runtime environment.

// No code snippet provided as PHP does not directly support running multiple languages within the same runtime environment. However, the concept can be implemented using a language-agnostic runtime like JVM or CLR.