reference checbox ?

 1    if ($_POST['approve[]']==''){   // the question is how do i reference the checkbox ***
        $arrErrors['approve[]'] = '*';
    }
 2      if (count($arrErrors) == 0) {
        //this is the connection
        require('connections/approve_list.php');
        header("Location:administrator.php");


In number (1) when the approval button is clicked it validate if the checkbox is checked

if no errors  then (2) it call the line and do the necessary update.

hope i make sense