Re: [PHP] issue with inheriting private property from abstract class

[Chris]

ok, i understand now that private members are NOT inherited.  i guess it 
was just throwing me off that var_dump()/print_r() display the parents 
private member, even tho its not really a member of the subclass.

thanks
Marek Kilimajer wrote:
Chris wrote --- napísal::
if anyone can, would you please explain why the below code does what 
it does?  I would expect $this->test in TestInstance to refer to the 
inherited $test from Test.  Using php5RC3.  Thanks.

<?php
abstract class Test {
    private $test;
    abstract public function addToTest($i);
}
class TestInstance extends Test {
    public function __construct() {
        $this->test = 0;
    }
    public function addToTest($i) {
        $this->test += $i;
    }
}
$t = new TestInstance();
$t->addToTest(3);
var_dump($t);
// test var SHOULD be private
echo "private test (shouldn't be able to access it directly, but i 
can): ".$t->test."\n\n";

/*
output
-------------------------------
object(TestInstance)#1 (2) {
  ["test:private"]=>
  NULL
  ["test"]=>
  int(3)
}
private test (shouldn't be able to access it directly, but i can): 3
*/
?>
The variable is private for Test, so TestInstance does not have access 
to it. By assigning 0 to $this->test in the constructor of TestInstance, 
you create a new property of TestInstance that is public (the default).

var_dump() shows it clearly:
object(TestInstance)#1 (2) {
  ["test:private"]=> NULL   <---- belongs to Test
  ["test"]=> int(3)         <---- belongs to TestInstance
}
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