When we are developing web applications frequently we have a lot of code in many languages (HTML, CSS, JS, PHP, AS3, etc).
Is better to have a different repository for each language or just one global repository for all the application?
When we are developing web applications frequently we have a lot of code in
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Version control system are usually split by projects, not by source language
If you are building a, say, web application, it is a normal thing (and it’s perfectly fine) to have files with different programming languages in it (HTML, CSS, PHP, JS, etc).
To answer your question:
No it is not a good idea to have a different repository for each source language.
Just use one repository for all the applications. In fact, most companies will probably have one repository for all the projects in the company.