In cases where PHP scripts behave differently after migrating to a new server, what steps can be taken to isolate server-related factors and address any resulting issues with PDF generation and email sending?

When PHP scripts behave differently after migrating to a new server, it could be due to differences in server configurations or dependencies. To isolate server-related factors and address issues with PDF generation and email sending, you can check the PHP version, server settings, and required extensions. Additionally, ensure that the necessary libraries for PDF generation and email sending are installed and properly configured on the new server.

// Check PHP version and server settings
echo phpversion();
echo phpinfo();

// Check for required extensions
if (!extension_loaded('pdf')) {
    echo 'PDF extension not loaded';
}

if (!extension_loaded('openssl')) {
    echo 'OpenSSL extension not loaded';
}

// Check if necessary libraries are installed
if (!function_exists('PDF_new')) {
    echo 'PDF library not installed';
}

if (!function_exists('mail')) {
    echo 'Mail function not available';
}