Getting wrong number of array of checkboxes when its checked

I have a loop of processes. And for each process there is checkbox:

</form>
for($y=0;$y<$len;$y++)
{   
    echo "<div class='proc'> <pre>";
    echo "<h6 >Process: ".$proc[$y]."      "   ;
    echo "People required: ".$num[$y].".      ";    
    echo "<input type='hidden' name='link[]' value='0'/><input type='checkbox' name='link[]' value='1'><i title='De-Activate Process' class='fi-link'></i>Connect Process</input></h6></pre>";
}
<input type = "submit" style="margin-left:300px; width:150px;" id="savebutton" name ="submit" class="button" value = "Create Project" onclick="userSubmitted = true;"/>
</form>

After submitting form I got the problem:

$process=$_POST['holdprocess'];
$number=$_POST['holdnumber'];
$link = $_POST["link"];

print_r($link);

foreach( $process as $proc => $eq ) 
{

    if($link[$proc]==1)
    echo "process: ".$eq." number: ".$number[$proc]." Process linked: yes<br>";
    else
    echo "process: ".$eq." number: ".$number[$proc]." Process linked: no<br>";
}

So if all checkboxes are eempty I got this: zero input When i check each checkbox system adds 0 to the array for each process: one input

Why does it happen? Thanks for any help