I have a class that has a list of valid keys, and an
array of values. When a value is added to the array
it's key is first checked against the list of valid
keys (this is to prevent injection issues we have been
having later on in the project).
class parent{
private $validkeys = 'title,color,name';
private $values = array();
}
That class is inherited by other classes that mostly
just have an expanded list of valid keys. I would like
to be able to update the valid key list without having
to craft a constructor for child objects. I would
rather not give each child class the constructor,
__construct()
{
$this->validkeys.= ',setting,...';
parent::__construct();
}
since most child classes have no need of a unique
constructor.
I thought of defining a protected extended valid keys
variable in the parent that the child could set that
the parent constructor would combine with the valid keys.
class parent{
private $validkeys = 'title,color,name';
private $values = array();
protected $extendedkeys;
__construct(){
$this->validkeys .= $this->extendedkeys;
}
}
But the children may become parents for further child
classes. And if the sub-child classes use the
$extendedkeys variable it will overwrite the
intermediate class's version.
Is there any way to tack on extra additional data by
the child classes without creating a constructor. I am
not wedded to strings as a means, it just needs to be
able to hold a string value.
Thanks
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