Simple error handling/catching/avoidance

Just wondering why the following code actually renders an error message instead of just then invoking the catch clause:

//start code
$iVar1 = 0;
$iVar2 = 10;
try {
echo $iVar2 / $iVar1;
} catch (Exception $e) {
echo "No division by zero allowed";
}
//end of code

Stay well

Jacob Kruger
Blind Biker
Skype: BlindZA
'...fate had broken his body, but not his spirit...'