checkboxlist not rendering checkbox checked correctly - yii2

Question

I have a two array that I'm going to include them into a checkbox,
echo Html::checkboxList('item', $selectedItem, $dataItem, [
'item' => function($index, $label, $name, $checked, $value) {
return "<label class='col-md-2'>
<input type='checkbox' {$checked} name='{$name}' value='{$value}'>
<span>{$label}</span>
</label>";
}
]);
I see in code in browser like this :
<label class="col-md-2">
<input 1="" name="item[]" value="1" disabled="" type="checkbox">
<span>Login</span>
</label>
The checked render into 1="" .
Please advise.
UPDATE
$dataItem
E:\wamp64\www\yii_tresnamuda\modules\it\views\request\preview.php:128:
array (size=6)
1 => string 'Login' (length=5)
2 => string 'Printer' (length=7)
3 => string 'Monitor' (length=7)
4 => string 'Computer' (length=8)
5 => string 'Network' (length=7)
6 => string 'Lain Lain' (length=9)
$selectedItem
E:\wamp64\www\yii_tresnamuda\modules\it\views\request\preview.php:129:
array (size=2)
2 => int 2
1 => int 1

Answer 1

The problem is in your {$checked} element of your item template. Try this:
echo Html::checkboxList('item', $selectedItem, $dataItem, [
'item' => function($index, $label, $name, $checked, $value) {
return "<label class='col-md-2'>
<input type='checkbox' name='{$name}' value='{$value}' ".($checked ? 'checked' : '').">
<span>{$label}</span>
</label>";
}
]);
Also, I think you have to change $selectedItem specification form [2=>2, 1=>1] to just [2,1]