4. How to fix "Headers already sent" error in PHP

How to fix "Headers already sent" error in PHP

Answer

Some functions modifying the HTTP header are:

Output can be:

  • Unintentional:

    • Whitespace before <?php or after ?>
    • The UTF-8 Byte Order Mark specifically
    • Previous error messages or notices

  • Intentional:

    • print, echo and other functions producing output
    • Raw <html> sections prior <?php code.

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