How can PHP developers ensure that the header() function for page redirection is used correctly without any output before it?

When using the `header()` function in PHP for page redirection, it is important to ensure that there is no output sent to the browser before calling this function. To prevent any output, developers can use output buffering to capture any output before sending headers. This can be achieved by using the `ob_start()` function at the beginning of the script and `ob_end_flush()` at the end to send the output. 

<?php
ob_start();

// Any output or processing code here

header('Location: newpage.php');
exit();

ob_end_flush();
?>

Keywords

PHP header() redirection output buffering ob_start()

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