In what situations can whitespace or output before the header() function cause issues in PHP scripts?

Having whitespace or output before the header() function in PHP scripts can cause issues because headers must be sent before any actual output is sent to the browser. This can lead to "headers already sent" errors or unexpected behavior in your script. To solve this issue, make sure there is no whitespace or output before the header() function is called. 

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

// Your PHP code here

header("Location: https://www.example.com"); // Redirect to another page

ob_end_flush(); // Flush the output buffer and send the headers
?>

Keywords

whitespace output header() function PHP scripts issues

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