What is the purpose of using defined('_CONF') or die('No input file specified') in a PHP file?

When using `defined('_CONF') or die('No input file specified')` in a PHP file, the purpose is to ensure that a specific constant, in this case `_CONF`, is defined before proceeding with the rest of the script. If the constant is not defined, the script will halt execution and output the message 'No input file specified'. 

<?php
// Check if _CONF constant is defined, otherwise halt execution
defined('_CONF') or die('No input file specified');

// Rest of the PHP script goes here
?>

Keywords

defined _CONF die PHP error

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