PHP magic getter and setter vs standard getter and setter, and why is a good idea to not use magic methods

https://stackoverflow.com/questions/6184337/best-practice-php-magic-methods-set-and-get

// NOTE: __get will trigger for getting private or unknow properties, __set will trigger for setting private or unknow properties. Best practice is to not use them.

a) Using __get and __set for getting and setting private property

class MyClass {
    private $firstField;
    private $secondField;

    public function __get($property) {
            if (property_exists($this, $property)) {
                return $this->$property;
            }
    }

    public function __set($property, $value) {
        if (property_exists($this, $property)) {
            $this->$property = $value;
        }
    }
}

$myClass = new MyClass();

$myClass->firstField = "This is a foo line";
$myClass->secondField = "This is a bar line";

echo $myClass->firstField;
echo $myClass->secondField;

/* Output:
    This is a foo line
    This is a bar line
 */

b) __GET and __SET triggers for unknow property

class MyClass {
    //private $firstField;
    //private $secondField;

    public function __get($property) {
            if (property_exists($this, $property)) {
                return $this->$property;
            } else { return 'getting unknow property' . PHP_EOL;}
    }

    public function __set($property, $value) {
        if (property_exists($this, $property)) {
            $this->$property = $value;
        } else { echo ' setting unknown property' . PHP_EOL;}
    }
}

$myClass = new MyClass();

$myClass->firstField = "This is a foo line";
$myClass->secondField = "This is a bar line";

echo $myClass->firstField;
echo $myClass->secondField;

/* Output:
     setting unknown property
     setting unknown property
   getting unknow property
    getting unknow property

  
 */

b) Using traditional setters and getters

class MyClass {

    private $firstField;
    private $secondField;

    public function getFirstField() {
        return $this->firstField;
    }

    public function setFirstField($firstField) {
        $this->firstField = $firstField;
    }

    public function getSecondField() {
        return $this->secondField;
    }

    public function setSecondField($secondField) {
        $this->secondField = $secondField;
    }

}

$myClass = new MyClass();

$myClass->setFirstField("This is a foo line");
$myClass->setSecondField("This is a bar line");

echo $myClass->getFirstField();
echo $myClass->getSecondField();

/* Output:
    This is a foo line
    This is a bar line
 */