What are the potential errors that may arise when using the header function in PHP to prevent caching?

When using the header function in PHP to prevent caching, potential errors may arise if the headers are sent after any output has been sent to the browser. To avoid this, make sure to call the header function before any output is sent. Additionally, ensure that the headers are correctly formatted to prevent any syntax errors. 

<?php
// Prevent caching
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");
header("Pragma: no-cache");

// Output your content here
echo "Hello, World!";
?>

Keywords

header function PHP caching errors prevent

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