PHP error: Cannot modify header information – headers already sent [duplicate]

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You cannot use header() once text has been output to the browser. As your header.php include presumably outputs HTML, header() cannot be used.

You can solve this in a couple ways:

  • Move the if statement above the header include (this won’t work, as you’ve indicated in comments that header.php sets the uid session and other vital stuff).
  • Call ob_start() at the top of the script to buffer the output.

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