Check box issue in laravel

I have check box inside a foreach loop so that i want to checkbox checked.

<?php
    $heads = TCG\Voyager\Models\Head::all();
    $i=0;                                 
    foreach($heads as $heads){
        $headvalues=explode(',',$test->reporting_head);
        echo $headvalues[$i]; 
        echo '<br>';
        echo $heads->id;
?>
<input type="checkbox"  name="check_list[]" value="{{$heads->id}}_{{$heads->email}}" <?php echo (($headvalues[$i]==$heads->id)? 'checked' : ''); ?>><label>{{$heads->headname}}</label>
<?php 
        $i++;
    }
?>

Here echo $headvalues[$i] are 1, 2 ,3 and echo $heads->id are 1,3,2.so i want to checked all this check boxes but now only one check box is checked.i think my logic has issue.I tried the following

<?php echo (($headvalues[$i]==$heads->id)? 'checked' : ''); ?>

Please help me