How can the "headers already sent" error be resolved when using PHP header() function?

The "headers already sent" error occurs when there is whitespace or output before the PHP header() function is called. To resolve this issue, make sure that there is no output (including whitespace) before calling the header() function. You can also use ob_start() to buffer the output and prevent any premature output. 

<?php
ob_start();
// Place this at the very beginning of your PHP file to buffer output

// Your PHP code here

header("Location: example.php");
exit();
?>

Keywords

PHP header function headers already sent output buffering ob_start

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