Get PHP class property from array

Question

I have an array looking something like this:

Array
(
    [0] => my_val_one
    [1] => my_val_two
)

I then have an object looking something like this:

   stdClass Object
    (
        [id] => 123123
        [name] => my_name
        [my_val_one] => stdClass Object
            (
                [my_val_two] => 1
                [my_val_three] => 2323
                [my_val_four] => 546567
            )
    )

I want to reference the following object value:

$ob->my_val_one->my_val-two

I'm not sure how to reference this class property from array values that I have.

How is the array related to the object (?). And why would you do my_val_one->my_val-two when these are two array values? That does not make any sense — OptimusCrime
– OptimusCrime, Commented Oct 3, 2017 at 13:11
Could you give us some background into why you need this, to begin with? — M. Eriksson
– M. Eriksson, Commented Oct 3, 2017 at 13:16
Considering your updated post, does $ob->my_val_one->my_val-two not work? — ProEvilz
– ProEvilz, Commented Oct 3, 2017 at 13:20

deceze · Accepted Answer · 2017-10-03 13:14:35Z

6

array_reduce helps here:

$path = ['my_val_one', 'my_val_two'];

$value = array_reduce($path, function ($o, $p) { return $o->$p; }, $ob);

answered Oct 3, 2017 at 13:14

deceze♦

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1 Comment

Tom Over a year ago

Spot on! That does exactly what I was looking for. Didn't know about array_reduce. I'll go off now and try to understand it!

OptimusCrime · Accepted Answer · 2017-10-03 13:27:24Z

-1

If I have understood correctly, you want to use the string values of the first array to access the StdClass object. You can do this by accessing the attributes dynamically. Here $obj is the StdClass and $arr is your array.

$obj->{$arr[0]}->{$arr[1]}

edited Oct 3, 2017 at 13:27

answered Oct 3, 2017 at 13:18

OptimusCrime

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