function binarySearch($low=0, $high, $search)
{
$mid = ceil(($low+$high) / 2);
if($search < $mid)
{
binarySearch($low, $mid-1, $search);
} else if($search > $mid)
{
binarySearch($mid+1, $high, $search);
} else
{
echo $mid;
}
}
echo binarySearch(0, 200, 122);