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PHP allows functions and classes to have the same name, but may cause readability and maintenance issues. For example: 1. It is difficult for other developers to determine whether the call is a function or a class; 2. It is easy to be confused when IDE is automatically completed; 3. There may be conflicts when project expansion. Although the syntax is correct, such as the function User() coexisting with the User-like and the parser can distinguish it, it is recommended to avoid problems through naming specifications, document descriptions, namespaces, etc., or use different names to improve clarity and security.

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