Fatal Error: Unsupported operand types.

[zero 0]

I'm a beginner at php and studying at a university.

I need to write a script which outputs the $afdeling and the corresponding "summed up" $omzet.

Then I need to output the $afdeling that has the most $omzet. //Don''t have this yet.

I wrote this using an example explaining a similar thing.

Since, I'm a beginner I can't find the error or know what is wrong.

I'm getting the error around on line 12.
This is what I have uptil now.

<?php
    $omzet[0] = array(10, 13, 16, 9, 19, 18);     
    $omzet[1] = array(9, 12, 18, 6, 21, 11);    
    $omzet[2] = array(6, 5, 8, 17, 15, 20);
    $omzet[3] = array(13, 12, 15, 23, 19, 22);
    $omzet[4] = array(11, 11, 11, 16, 7, 14);
    $omzet[5] = array(14, 14, 13, 18, 9, 20);
    $afdeling = 1;
    for($i=0; $i<6; $i++){    
        $totaal = 0;    
        while($omzet[$i] <> 99){
            $totaal = $totaal + $omzet[$i];
        }
    $totaal = $totaal;
    echo "Het totale omzet bedrag van afdeling " .$afdeling. " is " .$totaal. ". \n";
    $afdeling = $afdeling + 1;
    }
?>

Thanks in advance for the help.

[Rabbit]

The not equal operator is !=

[zero 0]

That's not the error.
not equal can be written like != or <>

[zero 0]

YES, got the first error. Had to put in the array, from the first 6 variables, ", 99" as the last number, else it couldnt use the "not equal"-operator I guess.. xD
Now for echo-ing the $afdeling with the highest value. :)