如何优化PHP开发中的排序和搜索算法性能

function quickSort($arr)
{
    if(count($arr) < 2) {
        return $arr;
    }
    
    $pivot = $arr[0];
    $less = array();
    $greater = array();
    
    for($i = 1; $i < count($arr); $i++) {
        if($arr[$i] <= $pivot) {
            $less[] = $arr[$i];
        } else {
            $greater[] = $arr[$i];
        }
    }
    
    return array_merge(quickSort($less), array($pivot), quickSort($greater));
}

$arr = [5, 3, 8, 2, 7, 1, 6, 4];
$result = quickSort($arr);
print_r($result); // 输出 [1, 2, 3, 4, 5, 6, 7, 8]

$arr = [5, 3, 8, 2, 7, 1, 6, 4];
sort($arr);
print_r($arr); // 输出 [1, 2, 3, 4, 5, 6, 7, 8]

function binarySearch($arr, $target)
{
    $left = 0;
    $right = count($arr) - 1;
    
    while($left <= $right) {
        $mid = floor(($left + $right) / 2);
        
        if($arr[$mid] == $target) {
            return $mid;
        } elseif($arr[$mid] < $target) {
            $left = $mid + 1;
        } else {
            $right = $mid - 1;
        }
    }
    
    return -1;
}

$arr = [1, 2, 3, 4, 5, 6, 7, 8];
$target = 5;
$result = binarySearch($arr, $target);
echo $result; // 输出 4

$arr = ["apple" => 1, "banana" => 2, "orange" => 3];
$key = "banana";
$result = array_search($key, $arr);
echo $result; // 输出 2