How can one troubleshoot issues with including external files in a PHP script within an HTML page?

To troubleshoot issues with including external files in a PHP script within an HTML page, ensure that the file path is correct and that the file exists. Use the correct PHP include function (include, require, include_once, require_once) based on your needs. Check for any syntax errors or issues in the included file that may be causing the problem. 

<?php
include 'path/to/external/file.php';
?>

Keywords

include require file path error handling debugging

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