How to access a class variable from same class

Question

In this snippet:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product_variant extends Model
{

    protected $primaryKey='variant_id';

    public $translationForeignKey = $this->primaryKey;
}

This rule is not working:

public $translationForeignKey = $this->primaryKey;

How can we access this variable that is in the same scope of this class?

Just an observations : I would have expected Product_variant to extend Product — RiggsFolly
– RiggsFolly, Commented Oct 23, 2015 at 8:59
You need to assign the properties value in the constructor, via a setter method or by setting the property after the class has been instantiated. — Jonnix
– Jonnix, Commented Oct 23, 2015 at 9:01

RiggsFolly · Accepted Answer · 2015-10-23 09:09:42Z

2

Either set the value in a constructor or create a getter to return the value.

// option 1

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product_variant extends Model
{

    protected $primaryKey='variant_id';

    public $translationForeignKey = '';

    // option 1
    public function __construct()
    {
        $this->translationForeignKey = $this->primaryKey;
    }

}

// option 2, you dont even need the other property in this method, unless its value may change during execution

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product_variant extends Model
{

    protected $primaryKey='variant_id';

    // option 2
    public function getTranslationForeignKey()
    {
         return $this->primaryKey;
    }

}

edited Oct 23, 2015 at 9:09

answered Oct 23, 2015 at 9:04

RiggsFolly

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2 Comments

Ashwini Agarwal Over a year ago

Just remove the $ after $this-> :)

RiggsFolly Over a year ago

@AshwiniAgarwal Thanks, copy/paste will get you Every Time

Ashwini Agarwal · Accepted Answer · 2015-10-23 09:04:56Z

1

At the time of defining the class you can only assign constant values to the class properties. Variables are not allowed here.

You need to do assignment part in the constructor.

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product_variant extends Model
{

    protected $primaryKey='variant_id';

    public $translationForeignKey;

    public function __construct() 
    {
        $this->translationForeignKey = $this->primaryKey;
    }
}

answered Oct 23, 2015 at 9:04

Ashwini Agarwal

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