Bueno puedes hacerlo así. Debe haber una mejor forma pero, mientras tanto
Código PHP:
$array[] = array(7, 3, 2, 1, 0);
$array[] = array(1, 1, 1, 0, 0);
$array[] = array(2, 4, 0, 0, 0);
$count1 = 0;
$count2 = 0;
$count3 = 0;
$count4 = 0;
$count5 = 0;
foreach($array as $k => $v){
foreach($v as $kk => $vv){
if($kk == 0 & $vv == 0){
$count1++;
}
if($kk == 1 & $vv == 0){
$count2++;
}
if($kk == 2 & $vv == 0){
$count3++;
}
if($kk == 3 & $vv == 0){
$count4++;
}
if($kk == 4 & $vv == 0){
$count5++;
}
}
}
$arrayFinal = array($count1,$count2,$count3,$count4,$count5);
echo "<pre>";
print_r($arrayFinal);
echo "</pre>";