What methods can be used to troubleshoot issues with headers not being sent in PHP?

One method to troubleshoot issues with headers not being sent in PHP is to check for any whitespace or output before the header function is called. This can prevent headers from being sent properly. Another method is to make sure that the header function is called before any content is output to the browser. 

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

// Check for any whitespace or output before calling header function
if (!headers_sent()) {
    header('Location: https://www.example.com');
    exit;
}

ob_end_flush(); // Flush the output buffer
?>

Keywords

headers troubleshooting PHP functions errors

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