Expression is not allowed as field default value

Question

I am trying to make $app available for the whole class.

First, I get:

"Expression is not allowed as field default value"

Second, on line 5, I get:

Unidentified variable $app

How can I achieve my goal?

class UserController extends XController
{
    var $app = Yii::app();;
    public function init()
    {
        $test = $app;

Why 2 `semicolon ;` in this line `var $app = Yii::app();;` ?? — Nana Partykar, Jan 27 '16 at 12:34
The default value for members must be a constant expression, not (for example) a variable, a property, or a function call. http://php.net/manual/en/language.oop5.constants.php — aya, Oct 24 '18 at 07:53

score 47 · Accepted Answer · edited Jun 12 '20 at 14:37

You can not call a method to set a default value for a variable in PHP, not even if it is a static method. Change it to be set in the constructor:

use Yii;

class UserController extends XController    
{
    var $app;

    function __construct() {
        $this->app = Yii::app();
    }

    public function init()    
    {
        $test = $this->app;
    } 
}

As a side note, you should not use the var keyword in PHP versions > 4, see this question for an explanation.

Expression is not allowed as field default value

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