рекуртивный бинарный поиск PHP
function binarySearch(Array $arr, $start, $end, $x){
if ($end < $start)
return false;
$mid = floor(($end + $start)/2);
if ($arr[$mid] == $x)
return true;
elseif ($arr[$mid] > $x) {
// call binarySearch on [start, mid - 1]
return binarySearch($arr, $start, $mid - 1, $x);
}
else {
// call binarySearch on [mid + 1, end]
return binarySearch($arr, $mid + 1, $end, $x);
}
}
// Driver code
$arr = array(1, 2, 3, 4, 5);
$value = 5;
if(binarySearch($arr, 0, count($arr) - 1, $value) == true) {
echo $value." Exists";
}
else {
echo $value." Doesnt Exist";
}
Abdullah Aboelkhair