扩展类以使用子私有变量

Question

I have a class in a vendor folder which have an array

private $mids = [
    'a' =>'b',
    'c' => 'd'
];
private $config = [
    'sid' => null,
    'aid' => null,
];

and a constructor which sets up private $config

function __construct($config){
    foreach ($config as $key => $value) {
        if (array_key_exists($key, $this->config)) {
            $this->config[$key] = $value;
        }
    }
}

I want to update $mid with a new key/value 'x' => 'y' so i extended the class and copied the parent constructor to child constructor.

But when i try to call the functions which are defined in the parent i get the error that undefined $this->config($key). so the function is using the parent $config property instead of childs.

What am i doing wrong?

Or what is the best way to do this instead of editing the vendor source

Answer 1

Make your variable protected instead of private if you want to use them in your child class .

protected $mids = [
'a' =>'b',
'c' => 'd'
 ];
protected $config = [
  'sid' => null,
  'aid' => null,
];