Php class Variable as function parameter

Question

How is it possible to use a class variable as a function parameter?

Example:

class Test {

    protected $img = '';

    protected function foo($var = $this->img)
    {
       ... some code ...
    }

}

Thus is this good practice?

You don't. Test if $var is.. something, if it isn't use $this->img, — Jonnix
– Jonnix, Commented Sep 16, 2016 at 8:54
$this refers to the current object instantiated from the class and therefore sort of doesn't exist until new Test() has been called; you can use a class constant for default data though protected function foo($var = self::IMG) { ... } — CD001
– CD001, Commented Sep 16, 2016 at 8:54
Is it good practise? It totally depends on what you're trying to do. — Jonnix
– Jonnix, Commented Sep 16, 2016 at 10:02

Boris Savic · Accepted Answer · 2016-09-16 08:56:36Z

2

I am not 100% sure, but I thing you can't. You can achieve the same like this:

class Test {

    protected $img = '';

    protected function foo($var = null)
    {

        if(is_null($var))
            $var = $this->img;

       ... some code ...
    }

}

answered Sep 16, 2016 at 8:56

Boris Savic

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