What are potential causes of the error message "Cannot modify header information" in PHP scripts?

The error message "Cannot modify header information" in PHP scripts typically occurs when there is output sent to the browser before header functions are called. To solve this issue, make sure there is no whitespace or any other output before calling functions like header() or setcookie(). Additionally, ensure that these functions are called before any HTML content or PHP output. 

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

// Your PHP code here

ob_end_flush(); // Flush output buffer

Keywords

header PHP output buffering ob_start ob_end_clean

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