Voxforem Technologies interview question
What’s the difference between include, require, include_once, and require_once — and when does each fail?
Interview Answer
Anonymous
21 Nov 2025
runtime vs parse-time failure, behavior on missing files, cost of _once, use-cases (libraries vs optional files), and autoloading alternative. Key: require causes a fatal error if missing; include issues a warning but continues. _once prevents redeclaration but has slight performance overhead.