Keep the check in checkbox on page reload

I have the form:

foreach($array as $c){
        echo '<tr><td>';
            echo '<input type="checkbox" name="check[]" value="'.$c.'"';

            if(isset($_POST['check'])){
                echo 'checked="checked"';   
            }

            echo '>';
        echo '</td></tr>';
    }

I want to keep the check mark in the same checkbox on page reload(in case an error occured).The problem is that this script checks all checkboxes , instead of checking only the one that have been checked previously.