How can the ob_start() function help resolve issues with header modification in PHP?

When modifying headers in PHP, it is important to ensure that no output has been sent to the browser before attempting to modify headers. This can be a common issue when trying to set headers using functions like header() or setcookie(). The ob_start() function in PHP can help resolve this issue by buffering the output, allowing you to modify headers even after output has been sent. 

<?php
ob_start();

// Code that may generate output

header('Location: newpage.php');

ob_end_flush();
?>

Keywords

ob_start header modification PHP output buffering buffer output

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