How can one ensure that a PHP script on a CD is secure and functions properly on different systems?

To ensure that a PHP script on a CD is secure and functions properly on different systems, one should avoid using absolute paths and instead use relative paths for file inclusions and references. This ensures that the script can locate files regardless of the system it is running on. Additionally, sanitize all user inputs to prevent SQL injection and other security vulnerabilities. 

// Use relative paths for file inclusions
include_once dirname(__FILE__) . '/config.php';

// Sanitize user inputs to prevent SQL injection
$username = mysqli_real_escape_string($conn, $_POST['username']);
$password = mysqli_real_escape_string($conn, $_POST['password']);

Keywords

PHP script security cross-platform CD system compatibility

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