How can the warning "Cannot modify header information" be resolved in PHP?

The warning "Cannot modify header information" in PHP occurs when there is an attempt to change header information after it has already been sent to the browser. To resolve this issue, make sure that no output is sent to the browser before calling functions like header() or setcookie(). To fix this, you can use output buffering to capture the output before sending it to the browser. 

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

// Your PHP code here

ob_end_flush(); // Send the output to the browser

Keywords

header output buffering ob_start ob_end_flush ob_clean

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