function countValuesInRange($arr, $from, $to) {
$count = 0;
$size = count($arr);
for ($i = 0; $i < $size; $i++) {
if ($arr[$i] >= $from && $arr[$i] <= $to)
$count++;
}
return $count;
}
$arr = array(3, 6, 0, 17, 9, 1, 8, 7, 4, 10, 18, 11, 20, 30);
$from = 5;
$to = 12;
echo countValuesInRange($arr, $from, $to);
/*
run:
6
*/