Question about redefining public or protected properties. #16296
Description
Description
Why does PHP allow redefining (redeclaring) a public or protected property with the same name in a derived class without hiding the corresponding property in the base class? In C++, equivalent code will output the expected result. So is this a bug? If not, what is the significance of allowing this?
The following code:
<?php
class Base
{
private int $pv = 0;
protected int $pt = 0;
public int $pb = 0;
public function setBase(int $i) { $this->pv = $i; $this->pt = $i; $this->pb = $i; }
public function dump() { echo "private(base):$this->pv; protected(base):$this->pt; public(base):$this->pb\n"; }
};
class Derived extends Base
{
private int $pv = 0;
protected int $pt = 0;
public int $pb = 0;
public function setDerived(int $i) { $this->pv = $i; $this->pt = $i; $this->pb = $i; }
public function dump() { parent::dump(); echo "private(derived):$this->pv; protected(derived):$this->pt; public(derived):$this->pb\n"; }
};
$o = new Derived;
$o->setBase(2);
$o->dump();
$o->setDerived(6);
$o->dump();Resulted in this output:
private(base):2; protected(base):2; public(base):2
private(derived):0; protected(derived):2; public(derived):2
private(base):2; protected(base):6; public(base):6
private(derived):6; protected(derived):6; public(derived):6
But I expected this output instead:
private(base):2; protected(base):2; public(base):2
private(derived):0; protected(derived):0; public(derived):0
private(base):2; protected(base):2; public(base):2
private(derived):6; protected(derived):6; public(derived):6
PHP Version
8.3.12
Operating System
No response