PHP Laravel foreach does not modify the value

Question

I am writing code to sort eloquent relationship instance in the parent.

$categories = CategoryMain::with('subs')->get();
    foreach($categories as &$category){
        $category->sub = $category->subs->sortBy('name');
    }

I get the correct arrangement inside the foreach loop, which i verify by doing die(var_dump());,

However, once it is outside, it seems like it is not changed at all. Why is it happening?

those are the only code.. What i want to achieve is sorting the subs, which is already correct in the foreach, but after it finishes, it does not modify the value @KrisRoofe — Brian Ruchiadi
– Brian Ruchiadi, Commented Jun 15, 2017 at 3:43
sub vs subs. Are you sure you've spelled these correctly? — sisve
– sisve, Commented Jun 15, 2017 at 4:25

Rahul Gupta · Accepted Answer · 2017-06-15 04:38:19Z

2

Try something like this and see what is the output:

$categories = CategoryMain::with('subs')->get();

$counter = 0;
foreach($categories as $category) {
    $categories[$counter]->sub = $category->subs->sortBy('name');
    $counter++
}
//output the data of catgories
dd($categories);

answered Jun 15, 2017 at 4:38

Rahul Gupta

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2 Comments

Brian Ruchiadi Over a year ago

this way will work i think.. but why we cannot directly change it using the iterator on for loop?

Rahul Gupta Over a year ago

The reason for using an iterator with foreach loop is to save the new values that are generated inside the loop to the original Collection object. The $category variable is just a local variable which has scope limited to the loop itself

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