What common issue does the forum thread address regarding the "header already sent" error in PHP?

The common issue addressed in the forum thread regarding the "header already sent" error in PHP is that any output sent to the browser before calling the header() function will cause this error. To solve this issue, make sure there is no whitespace or any other output before calling the header() function, and ensure that the header() function is called before any HTML content or output. 

<?php
ob_start(); // Start output buffering
// Place all your PHP code here

// Example of using the header() function
header("Location: https://www.example.com");
exit();

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

Keywords

output buffering ob_start ob_end_flush header headers_sent

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