How can developers efficiently migrate PHP programs to newer PHP versions to ensure functionality and security?

To efficiently migrate PHP programs to newer PHP versions, developers should first review the PHP documentation for the new version to understand any deprecated features or changes in syntax. They should then update their code accordingly, testing it thoroughly to ensure functionality and security. Utilizing tools like PHP Compatibility Checker can help identify potential issues before upgrading.

// Example code snippet for migrating PHP programs to newer versions
// Update deprecated functions or features
// Before:
mysql_connect('localhost', 'username', 'password');

// After:
mysqli_connect('localhost', 'username', 'password');