What potential errors or warnings should be checked for when encountering the message "header already sent in" in PHP?
When encountering the message "header already sent in" in PHP, it means that there was output sent to the browser before PHP headers were set. This can be caused by whitespace before the opening <?php tag, echo/print statements, or HTML content before header() function calls. To solve this issue, make sure to set headers before any output is sent to the browser.
<?php
ob_start(); // start output buffering
// your PHP code here
ob_end_flush(); // flush the output buffer
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