What are common solutions for resolving the error message "Warning: Cannot modify header information" in PHP programming?

The "Warning: Cannot modify header information" error in PHP occurs when there is an attempt to send headers after output has already been sent to the browser. To resolve this issue, make sure that no output is sent before calling functions like header() or setcookie(). One common solution is to move these header-related functions to the beginning of the script before any output. 

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

// Your PHP code here

header('Location: new_page.php'); // Example of using header function

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

Keywords

header output buffering ob_start ob_end_flush headers_sent

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