In what situations should the 'protected' keyword be replaced with 'private' in PHP class properties?

The 'protected' keyword should be replaced with 'private' in PHP class properties when those properties should not be accessible or modified by subclasses. By changing the visibility to 'private', you ensure that only the class itself can access or modify those properties, providing better encapsulation and preventing unintended changes from subclasses. 

class MyClass {
    private $privateProperty;
    
    public function __construct($value) {
        $this->privateProperty = $value;
    }
    
    public function getPrivateProperty() {
        return $this->privateProperty;
    }
}

$myObject = new MyClass('Hello');
echo $myObject->getPrivateProperty(); // Outputs: Hello

Keywords

PHP class properties protected private access control

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