How can the use of relative paths in PHP code impact the functionality when files are located on different servers?

When using relative paths in PHP code, the functionality can be impacted when files are located on different servers because the relative path may not resolve correctly across different server environments. To solve this issue, it's best to use absolute paths instead of relative paths in your PHP code to ensure consistent file access regardless of the server location.

// Using absolute path instead of relative path
$file_path = '/var/www/html/example/file.txt';
$file_contents = file_get_contents($file_path);
echo $file_contents;