Answer
include loads and executes a file at runtime to reuse common code.
Quick Answer
include() inserts the content of one PHP file into another at runtime. If the file is not found, it shows a warning but script continues. Use for optional file inclusions (template partials, optional config). include_once ensures the file is included only once even if include is called multiple times - prevents function redeclaration errors.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ