How can the issue of headers already sent be resolved in PHP when using header() function for redirection?

The issue of "headers already sent" in PHP occurs when there is output (such as whitespace or text) before the header() function is called for redirection. To resolve this issue, ensure that there is no output before calling the header() function, or use output buffering to capture any output before sending headers. 

<?php
ob_start(); // Start output buffering

// Your PHP code here

ob_end_clean(); // Clean the output buffer without sending it to the browser

header('Location: new_page.php'); // Redirect to a new page
exit(); // Ensure no further code is executed after redirection
?>

Keywords

headers header function redirection output buffering ob_start

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