PHP protected and an assault
<?php
class Victim {
protected $money = 100;
public function __toString() {
return (string) $this->money;
}
}
class Offender extends Victim {
function assault(Victim $victim) {
$victim->money = 0;
}
}
$victim = new Victim;
$offender = new Offender;
$offender->assault($victim);
print (string)$victim;
?>Courtesy of Damien Tournoud. Actually this is documented:
Objects of the same type will have access to each others private and protected members even though they are not the same instances. This is because the implementation specific details are already known when inside those objects.
Comments
Not really a WTF
Many languages work that way. Here is the same thing in C++: https://gist.github.com/c8b2d9768709cf0b7641
lol have you ever done oop?
lol have you ever done oop? protected does not mean guarded and fortified lol
protected != private
PHP has many WTFs, but this isn't one of them
PHP's private/protected/public accessors work exactly the same way as in C#, which work the same way as Java, which work the same way as C++
The documentation quote above actually refers to something different:
$a = new Foo();$b = new Foo();
$b->doSomethingToObject($a);
In doSomethingToObject(), $b can access private members of $a because they are both the same object type.
As an added bonus, here's some nonobvious fun:
class Ancestor {
private $x;
public function __construct() { $this->x = 0; }
public function showAncestorValue() { echo $this->x."\n"; }
}
class Descendant extends Ancestor {
private $x;
public function setTo($z) { $this->x = $z; }
}
$a = new Descendant();
$a->setTo(99);
$a->showAncestorValue();
# prints:
# 0
Outputs:
.. again, same behaviour as C++/Java, but Descendant::$x refers to a different variable than Ancestor::$x even though they have the same name.
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