PHP class object as other class parameter

Question

I have a problem, I need to rewrite my c++ program in PHP, I have very little experience.

Here is my code:

class Variable {
    public $power;
    public $shortcut;
    public $value;
    public function __construct($a, $b, $c) {
        $this->shortcut=$a;
        $this->value=$b;
        $this->power=$c;
    }
};

class Formula {
    Variable var1;
    Variable var2;
    Variable var3;
    $sign;
};

Formula class have 3 parameters which are objects of Variable class, How do I write something like that in PHP?

What is $sign? Also, your forumla variables should have $ in front of them: Variable $var1; — Blue
– Blue, Commented Oct 18, 2018 at 7:19
You just did, except for a few syntax errors. I don't really know, what's the issue here. — Jakub Matczak
– Jakub Matczak, Commented Oct 18, 2018 at 7:19

Maksym Fedorov · Accepted Answer · 2018-10-18 07:24:36Z

1

PHP doesn't support typed attributes of a class. You can create accessor methods and mutator methods to control of attributes type. For example:

class Formula {

    /**
     * @var Variable
     */
    private $var1;

    /**
     * @var Variable
     */
    private $var2;

    /**
     * @var Variable
     */
    private $var3;

    public function setVar1(Variable $value)
    {
        $this->var1 = $value;
    }

    public function getVar1()
    {
        return $this->var1;
    }

    public function setVar2(Variable $value)
    {
        $this->var2 = $value;
    }

    public function getVar2()
    {
        return $this->var2;
    }

    public function setVar3(Variable $value)
    {
        $this->var3 = $value;
    }

    public function getVar3()
    {
        return $this->var3;
    }
};

answered Oct 18, 2018 at 7:24

Maksym Fedorov

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2 Comments

Gordon Over a year ago

PHP doesn't support typed attributes of a class yet. But it will as of 7.3. See wiki.php.net/rfc/typed_properties_v2 for details.

Maksym Fedorov Over a year ago

@Gordon, yes but it will be in future

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