How can the "headers already sent" error be resolved when using the header function in PHP?

The "headers already sent" error in PHP occurs when there is any output (such as HTML, whitespace, or error messages) sent to the browser before the header() function is called. To resolve this issue, make sure that there is no output sent before calling the header() function, and the header() function should be called before any output is sent to the browser. 

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

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

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

Keywords

PHP headers header function output buffering error

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