Are there any common pitfalls or challenges associated with using private, public, and protected properties in PHP classes?

One common challenge associated with using private, public, and protected properties in PHP classes is ensuring proper encapsulation and managing access levels. It is important to carefully consider which properties should be private, public, or protected to maintain data integrity and security within the class. 

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

    // Getter and setter methods for private property
    public function getPrivateProperty() {
        return $this->privateProperty;
    }

    public function setPrivateProperty($value) {
        $this->privateProperty = $value;
    }
}

Keywords

visibility access modifiers encapsulation inheritance scope

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