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you have actually been give the answer - don't put function definitions inside of other function definitions.

some other possibilities - it's conditionally defined - inside another function definition that hasn't been called yet or inside some conditional logic that didn't execute it's not within php tags at all it's using a short opening tag that's not enabled it's within a comment the OP needs to post the complete contents (including the opening php tag in the file) of redirect.php in order to either confirm or eliminate the various possibilities as the cause.