What potential pitfalls should PHP developers be aware of when transitioning from website projects to larger projects like online customer management systems?

One potential pitfall PHP developers should be aware of when transitioning to larger projects like online customer management systems is the lack of scalability and maintainability in their code. To address this issue, developers should focus on implementing modular and reusable code, following best practices such as object-oriented programming and design patterns, and utilizing frameworks to streamline development processes.

// Example of implementing object-oriented programming in PHP
class Customer {
    private $name;
    private $email;

    public function __construct($name, $email) {
        $this->name = $name;
        $this->email = $email;
    }

    public function getName() {
        return $this->name;
    }

    public function getEmail() {
        return $this->email;
    }
}

$customer = new Customer("John Doe", "john.doe@example.com");
echo $customer->getName();
echo $customer->getEmail();