How does the placement of include() or require() affect the usage of setcookie in PHP?

When using setcookie in PHP, it is important to place the function before any output is sent to the browser. This is because setcookie sends a header to the browser, and headers must be sent before any content. If include() or require() is used to include a file that contains setcookie after output has already been sent, it will result in an error. To solve this issue, make sure to include the file containing setcookie before any output is generated. 

<?php
include('cookie_file.php'); // Include file containing setcookie before any output

// Output starts here
echo "Hello World!";
?>

Keywords

include require setcookie PHP placement

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