How can developers avoid common mistakes when designing classes and functions that need to interact with each other in PHP?

When designing classes and functions that need to interact with each other in PHP, developers can avoid common mistakes by clearly defining the responsibilities of each class, using proper access modifiers to control visibility, and ensuring proper error handling and validation. Additionally, developers should follow SOLID principles to create classes that are cohesive, loosely coupled, and easy to maintain. 

class User {
    private $name;

    public function setName($name) {
        if (empty($name)) {
            throw new InvalidArgumentException("Name cannot be empty");
        }
        $this->name = $name;
    }

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

$user = new User();
$user->setName("John Doe");
echo $user->getName(); // Output: John Doe

Keywords

Inheritance Polymorphism Dependency Injection Encapsulation Namespaces

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