What are the common mistakes or misunderstandings that developers coming from C-Programming may encounter when working with PHP classes and objects?

One common mistake that developers coming from C-Programming may encounter when working with PHP classes and objects is not understanding the concept of visibility (public, private, protected) for class properties and methods. In C, all variables and functions are typically public by default, whereas in PHP, it's important to explicitly define the visibility of properties and methods. To solve this issue, make sure to properly define the visibility of class members to control access and encapsulation.

class MyClass {
    private $privateProperty;
    protected $protectedProperty;
    public $publicProperty;

    private function privateMethod() {
        // do something
    }

    protected function protectedMethod() {
        // do something
    }

    public function publicMethod() {
        // do something
    }
}