What is the "header already sent" error in PHP and how can it be resolved?
The "header already sent" error in PHP occurs when there is any output (such as echo statements, whitespace, or HTML) before the header() function is called to set HTTP headers. To resolve this issue, ensure that no output is sent before calling header() functions in your PHP script.
<?php
ob_start(); // Start output buffering
// Your PHP code here
ob_end_flush(); // Flush the output buffer
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