How can I access properties in objects contained in an array - see code

Question

How can I access properties in objects contained in an array?

Why does the code below doesn't work?

<?php

class Car{
    private $model;
    private $color;
    private $price;
    public function __car($model, $color, $price)
    {
        this.$model = $model;
        this.$color = $color;
        this.$price = $price;
    }
}

$cars = [];
$jetta = new Car("Jetta", "Red", 2500);
$cars[] = $jetta;

$cobalt = new Car("Cobalt", "Blue", 3000);
$cars[] = $cobalt;

// this is the part of the code that doesn't work
// I need to output the values from the objects, model, color and price
echo $cars[0]->$model; 
echo $cars[0]->$color;
echo $cars[0]->$price;

Thanks

Go look up what private visibility means.

C3roe
– C3roe

2016-07-19 14:21:45 +00:00
Commented Jul 19, 2016 at 14:21 — C3roe
– C3roe, Commented Jul 19, 2016 at 14:21

nyumerics · Accepted Answer · 2016-07-19 14:20:01Z

3

Your syntax and constructor is wrong.

Here is the final code:

<?php

class Car{
    // the variables should be public
    public $model;
    public $color;
    public $price;
    // this is how you write a constructor
    public function __construct($model, $color, $price)
    {
        // this is how you set instance variables
        $this->model = $model;
        $this->color = $color;
        $this->price = $price;
    }
}

$cars = [];
$jetta = new Car("Jetta", "Red", 2500);
$cars[] = $jetta;

$cobalt = new Car("Cobalt", "Blue", 3000);
$cars[] = $cobalt;

// this is how you access variables
echo $cars[0]->model; 
echo $cars[0]->color;
echo $cars[0]->price;

?>

answered Jul 19, 2016 at 14:20

nyumerics

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1 Comment

nyumerics Over a year ago

Whoever has down voted, please check the answer again.

Jose Manuel Abarca Rodríguez · Accepted Answer · 2016-07-19 14:30:37Z

2

There are multiple errors in your code, I have pointed them with arrows ◄■■■ :

<?php

class Car{
    public $model;   //◄■■■■■■■■■■ IF PRIVATE YOU WILL NOT
    public $color;   //◄■■■■■■■■■■ BE ABLE TO ACCESS THEM
    public $price;   //◄■■■■■■■■■■ FROM OUTSIDE.
    public function __construct ($model, $color, $price) //◄■■■ CONSTRUCT
    {
        $this->model = $model;   //◄■■■■■■■■■■■■■■■■■■■■■■■ NOT THIS.$
        $this->color = $color;   //◄■■■■■■■■■■■■■■■■■■■■■■■ NOT THIS.$
        $this->price = $price;   //◄■■■■■■■■■■■■■■■■■■■■■■■ NOT THIS.$
    }
}

$cars = [];
$jetta = new Car("Jetta", "Red", 2500);
$cars[] = $jetta;

$cobalt = new Car("Cobalt", "Blue", 3000);
$cars[] = $cobalt;

// this is the part of the code that doesn't work
// I need to output the values from the objects, model, color and price
echo $cars[0]->model;   //◄■■■■■■■■■■■■■■■■■■ PUBLIC PROPERTY WITHOUT $.
echo $cars[0]->color;   //◄■■■■■■■■■■■■■■■■■■ PUBLIC PROPERTY WITHOUT $.
echo $cars[0]->price;   //◄■■■■■■■■■■■■■■■■■■ PUBLIC PROPERTY WITHOUT $.
?>

edited Jul 19, 2016 at 14:30

answered Jul 19, 2016 at 14:24

Jose Manuel Abarca Rodríguez

10.4k3 gold badges35 silver badges42 bronze badges

1 Comment

fs_tigre Over a year ago

Thanks a lot for the explanation-comments, that helps.

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