What are the best practices for handling header information in PHP to avoid errors like "Cannot modify header information"?

When working with header information in PHP, it is important to ensure that no output is sent to the browser before calling functions like header(). To avoid errors like "Cannot modify header information", you should make sure that there is no whitespace or HTML tags before the header() function calls. One way to prevent this issue is to use output buffering to capture any output before sending headers. 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer

Keywords

header PHP output buffering ob_start ob_end_flush

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