How can one prevent or resolve the issue of "Cannot modify header information - headers already sent" in PHP?

output buffering
ob_start
ob_end_flush
header
error_reporting

The "Cannot modify header information - headers already sent" error occurs when PHP tries to send headers to the browser after output has already been sent. To prevent this issue, make sure there is no whitespace or output before the `header()` function is called. To resolve it, you can use output buffering to capture any output before sending headers.

php

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

// Your PHP code here

ob_end_flush(); // Send output buffer

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How can one prevent or resolve the issue of "Cannot modify header information - headers already sent" in PHP?

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