$test = array();

// initialize the array with random values
for($i=0; $i<5; $i++)
{
    for ($j=0; $j < 5; $j++) {
        $test[$i][$j] = rand(0, 10);
    }
}

displayArray($test); // custom function I wrote to display the array in a HTML table


//x = rows, y = columns

for ($x = 0; $x<5; $x++) // loop over each row
{
    if($x == 5-1) // if this is the LAST row
        continue; // skip this iteration

    $y = $x+1; // initialise Y to the row numer + offset 1
    // i.e. this will point to the cells on the RIGHT of the diagonal

    // display value
    echo '$test['.$x.']['.$y.'] = '.$test[$x][$y] .'<br/>';
}