Getter and Setter? [closed]

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I’m not a PHP developer, so I’m wondering what the advantages and disadvantages are in PHP to using explicit getter/setters, in a pure OOP style, with private fields (the way I like):

class MyClass {
    private $firstField;
    private $secondField;

    public function getFirstField() {
        return $this->firstField;
    }
    public function setFirstField($x) {
        $this->firstField = $x;
    }
    public function getSecondField() {
        return $this->secondField;
    }
    public function setSecondField($x) {
        $this->secondField = $x;
    }
}

or just public fields:

class MyClass {
    public $firstField;
    public $secondField;
}

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