How can one troubleshoot issues with setting HTTP headers in PHP?

If you are experiencing issues with setting HTTP headers in PHP, ensure that you are not outputting any content before calling the header() function. Headers must be set before any content is sent to the browser. Additionally, make sure there are no syntax errors or typos in the header function calls. 

<?php
// Correct way to set HTTP headers before any content is output
header('Content-Type: text/html');
header('X-My-Header: MyValue');

// Output content after setting headers
echo "Hello, World!";
?>

Keywords

HTTP headers troubleshooting PHP functions errors

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