What are common reasons for the PHP header function not working as expected?

The PHP header function may not work as expected due to output being sent before the header function is called, causing a "headers already sent" error. To solve this issue, make sure there is no output (such as HTML, whitespace, or error messages) before calling the header function. 

<?php
ob_start(); // Start output buffering
// Your PHP code here
header("Location: https://www.example.com");
exit();
ob_end_flush(); // Flush output buffer
?>

Keywords

PHP header function HTTP headers server-side scripting troubleshooting

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