PHP-OOP - Array from parent class to subclass

Hi!

look this simple example:

class myClass {

var $lang = 'en';
var $translations = array();

public function __construct($lang,$translations = array()) {
$this->lang = $lang;
$this->array_translations = $translations;
}

public function foo() {
echo $this->lang;
echo $this->array_translations['2'];
}
}


class myClass2 extends myClass {
public function __construct() {
}

public function foo2() {
echo $this->lang;
echo $this->array_translations['2'];
}

}


$class = new myClass($lang,$translations);

$class2 = new myClass2();
$class2->foo2();

Why array_translations doesn't read in class myClass 2? Lang yes.. but array elements no? I don't understand

Because
1. You didn't give myClass2 the list of translations. Or the language for that matter - it's showing you "en" because that's the default value.
2. You set up your own __construct which does not set $lang or $array_translations. If you want it to do that then (a) get rid of your version and let myClass's __construct take over, or (b) make your version call parent::__construct(...) with the right arguments.

Hi,

this is a misunderstanding of how objects work. The $translations property is an instance property, so every object has its own $translations. Setting the value for a particular object has no effect on the other instances that might exist at this point of time.

Think of a simpler example: If create a Mammal with the name "Peter" (could be a human, a dog, a cat, whatever), does that mean that all Humans (which are a subclass of Mammals) should now be named "Peter"?

Thanks for your answer.

I'have my array included in all page of my site:

$translations = array();
$translations['1'] = 'text1';
$translations['2'] = 'text2';
$translations['3'] = 'text3';
$translations['4'] = 'text4';
$translations['5'] = 'text5';
$translations['6'] = 'ecc';

I would like include this array element in my Class for being used in every subclass.

Is it possible?

If the array is known from the beginning, use a static property and set the array as the default value:



This way all subclasses will have a static property $x (or $translations in your case) set to a certain array. Note that the subclasses can still overwrite it. If you also want to prevent that, you have to access the property through getter/setter methods.

By the way, why do you use number strings as array indices? And why do you set the elements one after another instead of using a much shorter array literal?

Ok, but my array is external... is included in all pages, and contain more elements.
The problem is setting external array into static element.

Then use a setter method.

Many thanks Jacques1!

you have been useful

Ps it's strange that you have to assign the static element out of the classroom