In the given script, why does using include() instead of header() solve the redirection issue?

When using the header() function for redirection in PHP, it must be called before any output is sent to the browser. If there is any output, such as whitespace or HTML tags, before calling header(), it will result in a "headers already sent" error. Using include() to redirect instead of header() solves this issue because include() simply includes the content of another file in the current file without any header manipulation. This allows for the redirection to occur without worrying about the "headers already sent" error. 

<?php
// Redirect using include() instead of header()
include('redirect_page.php');
?>

Keywords

include header redirection PHP script

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