Dynamically add property to Yii CComponent based object from within the object in PHP?

Question

In PHP you can do the following:

$foo = new Foo();
$foo->$newPropertyName = $value;

To dynamically add new property to the object. However when I try to do that:

$this->$newPropertyName = $value;

It doesn't work. How can I dynamically add new property from within the object?

UPDATE:

My class inherits from Yii CFormModel class. CFormModel overrides the PHP __set method so it causes the problem. How to do what I want? How to use default __set method?

@user3234352 - dollar is needed as new property name comes from variable — Joe
– Joe, Commented Jul 7, 2014 at 11:48
It's not nonsense. $newPropretyName is a variable that holds the new property name. I don't want to create property newPropertyName. The property name is unknown to the developer. It is going to come from database. — Joe
– Joe, Commented Jul 10, 2014 at 13:54

Félix Adriyel Gagnon-Grenier · Accepted Answer · 2015-03-01 14:20:33Z

1

$this->newPropertyName = $value;

can be called from inside any method of a class. in public scope it's that way:

$foo = new Foo();
$foo->newPropertyName = $value;

when using $this-> you don't put dollar signs.

However, you can try and force php to evaluate your variable (as in can vary) property name before assigning it to your property like this:

$foo->{$newPropertyName} = $value;

edited Mar 1, 2015 at 14:20

answered Jul 10, 2014 at 0:07

Félix Adriyel Gagnon-Grenier

8,93510 gold badges58 silver badges69 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

fire · Accepted Answer · 2014-07-07 11:05:30Z

0

It does work dynamically, there must be a bug in your code (maybe mispelling $newPropertyName)?

class Foo {

    public function addProperty($newPropertyName, $value) {
        $this->$newPropertyName = $value;
    }

}

$foo = new Foo();
$foo->addProperty('weather', 'raining');
echo $foo->weather;

answered Jul 7, 2014 at 11:05

fire

21.5k18 gold badges82 silver badges116 bronze badges

2 Comments

Joe Over a year ago

Hm, I just got the "Property Foo.xxx not defined" error. My PHP v. is 5.4.16 so it shouldn't be a problem.

Joe Over a year ago

Ah, I guess it might be because PHP magic __set ang __get methods are overriden by base class. That makes things more complicated... The base class is yii CFormModel.

Collectives™ on Stack Overflow

Dynamically add property to Yii CComponent based object from within the object in PHP?

2 Answers 2

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related