When should one use interfaces instead of Traits in PHP for method inheritance?

Interfaces should be used when you want to define a contract for a class to implement specific methods, ensuring consistency across different classes that implement the interface. Traits, on the other hand, should be used when you want to share methods among different classes without enforcing a specific contract. If you need to enforce method implementation, use interfaces. If you want to share method implementations, use traits.

interface LoggerInterface {
    public function log($message);
}

class FileLogger implements LoggerInterface {
    public function log($message) {
        // Log message to a file
    }
}

class DatabaseLogger implements LoggerInterface {
    public function log($message) {
        // Log message to a database
    }
}