Ключевое слово "final"

Разместив перед объявлениями методов или свойств класса ключевое слово "final", вы можете предотвратить их переопределение в дочерних классах.

Клонирование объектов Magic Methods

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Last updated: Sat, 27 Jan 2007

 

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Ключевое слово "final"

slorenzo at clug dot org dot ve
31-Oct-2007 12:13

<?php
class parentClass {
    public function someMethod() { }
}
class childClass extends parentClass {
    public final function someMethod() { } //override parent function
}

$class = new childClass;
$class->someMethod(); //call the override function in chield class
?>

penartur at yandex dot ru
22-Mar-2007 02:39

Note that you cannot ovverride final methods even if they are defined as private in parent class.
Thus, the following example:
<?php
class parentClass {
    final private function someMethod() { }
}
class childClass extends parentClass {
    private function someMethod() { }
}
?>
dies with error "Fatal error: Cannot override final method parentClass::someMethod() in ***.php on line 7"

Such behaviour looks slight unexpected because in child class we cannot know, which private methods exists in a parent class and vice versa.

So, remember that if you defined a private static method, you cannot place method with the same name in child class.

liumr at ustc dot edu
10-Mar-2007 10:29

this key word can describe a class or a class member function

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Клонирование объектов Magic Methods

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Last updated: Sat, 27 Jan 2007