Web Reference: This is a brilliant answer as it covers all the possibilities. I just wanted to add a fourth one: if you are trying to define a function with the same name as a build-in class, for instance get_class, you will get the same re-declaration error. Jan 16, 2026 · The “Cannot redeclare function” error in PHP is a common but avoidable issue caused by duplicate function declarations in the same scope. By understanding its root causes—such as accidental includes, missing namespaces, or conflicting names—you can quickly diagnose and fix it. The "Cannot redeclare function" error in PHP can be resolved by ensuring that function definitions are unique, using include_once or require_once, and considering namespaces for larger applications.
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