How can context switching impact the functionality of header variables in PHP?

Context switching can impact the functionality of header variables in PHP because they need to be set before any output is sent to the browser. To ensure that header variables are set correctly, make sure to set them before any content is echoed or printed to the browser. 

<?php
// Ensure header variables are set before any output
header('Content-Type: text/html');

// Your PHP code here
echo "Hello, world!";
?>

Keywords

context switching header variables PHP functionality impact error types

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