[Resolved] Warning: Cannot modify header information - headers already sent by

When you see this error, you just put this tiny code to begin your code:
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 ob_start()           turn on  buffer
 ob_end_flush()   turn off buffer and print all to browser


Example:

<?php

ob_start(); 

echo "Check phat";

header("Location: redirect.php");

ob_end_flush(); 

?>

Nguyen Si Nhan