laravel loop variable in controller code example

Example: $loop variable laravel

@foreach ($pages as $page)
    
{{ $loop->iteration }}: {{ $page->title }}
        @if ($page->hasChildren())
        

        @foreach ($page->children() as $child)
            
{{ $loop->parent->iteration }}.{{ $loop->iteration }}:
                {{ $child->title }}
        @endforeach
        
        @endif
    
@endforeach