[PHP] Variable Scope from child to parent

[Tyson Vanover]

I am trying to get a child class to pass an array of valid keys to it's 
parent when the constructor is run, and the parent appends the data to 
one of it's array of valid keys.  Then it walks through an array pulling 
out values that have valid keys, and putting them in an array for 
processing later.  I have tried explicitly stating the variable scope.

abstract class parentclass
{
  protected $vkeys= array('title1','title2','title3');
  protected $a;
        
  function __construct($set = NULL, $special = NULL)
  {
    self::$this->vkeys= array_merge(self::$this->vkeys, $special);        
    foreach($set as $key=>$value)
    {
      if (in_array($key,self::$this->vkeys))
      {
        $this->a[$key] = $value;
      }
    }
    print_r(self::$this->vkeys);  //output below
    print_r(self::$this->a);  //output below
  }
}
class childclass extends parentclass
{
  protected $vkeys= array('titleA', 'titleB', 'TitleC');

  function __construct($set, $special = NULL)
  {
    parent::__construct($set, self::$this->vkeys);
    unset(self::$this->vkeys);
  }
}

Unfortunately it seems to duplicate the child's array instead of 
appending.  Explicitly stating scope does not seem to help.


print_r(self::$this->vkeys);
Array (
  [0] => titleA
  [1] => titleB
  [2] => titleB
  [3] => titleA
  [4] => titleB
  [5] => titleB
)

print_r(self::$this->a);
Array()

Any thoughts?

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