PHP - Private class variables giving error: undefined variable

Question

I am getting the error \"Undefined variable: interval in C:\\wamp\\www\\DGC\\classes\\DateFilter.php\"

Here is my code for the DateFilter class:

clas         


        

Answer 1

You have to use $this->interval to access the member variable interval in PHP. See PHP: The Basics

class DateFilter extends Filter
{
    private $interval;    // this is correct.

    public function DateFilter($daysOld)
    {
        $this->interval = new DateInterval('P'.$daysOld.'D');   // fix this
    }

    function test()
    {
        echo $this->interval->format("%d days old 
");     // and fix this
    }
}