how to find empty value for specific key in multidimensional array

i have array like this

<?php
$array =
    array
    (
        array (
            0 => 1,
            1 => 'php',
            2 => 11,
            3 => 11,
            4 => 11,
            5 => 11,
            6 => 11,
        ),
        array (
            0 => 1,
            1 => 'php',
            2 => 11,
            3 => 11,
            4 => 11,
            5 => 11,
            6 => ,
        ),

    );

and i want to search in this multi-array to find if the key [6] => is empty.if it was empty in any array return false so how to do this

foreach($array as $item)
{
    foreach($item as $key=>$value)
    {
        print($key);
        if($key=="6" && $value==NULL)
        {
            echo "found";
            return false;
        }else{
            echo "not found";
            return true;
        }
    }
}

Answer

$empty = false;
foreach($array as $item)
{
    if(empty($item[6]))
    {
            $empty=true;
            break;
    }
}
return $empty;