PHP数组大小比较与区间校验：如何高效验证一维数组与二维区间数组的关系？

<?php
$arr1 = [8, 17, 23, 22, 25, 30, 42];
$arr2 = [[12, 15], [24, 28], [17, 25], [29, 33]];

function compareArrays($arr1, $arr2) {
    // 条件3：检查arr2中每个区间的有效性
    foreach ($arr2 as $interval) {
        if ($interval[0] >= $interval[1]) {
            return "Error: Invalid interval found in arr2.";
        }
    }

    // 条件2：检查arr2中区间是否互斥
    for ($i = 0; $i < count($arr2); $i++) {
        for ($j = $i + 1; $j < count($arr2); $j++) {
            if (max($arr2[$i][0], $arr2[$j][0]) <= min($arr2[$i][1], $arr2[$j][1])) {
                return "Error: Overlapping intervals found in arr2.";
            }
        }
    }

    // 条件1：检查arr1中的元素是否落在arr2的任何区间内
    foreach ($arr1 as $num) {
        foreach ($arr2 as $interval) {
            if ($num >= $interval[0] && $num <= $interval[1]) {
                return "Error: Element from arr1 falls within an interval in arr2.";
            }
        }
    }

    return "Success: All conditions are met.";
}

echo compareArrays($arr1, $arr2); // 输出错误信息，因为arr2中存在重叠区间和无效区间
?>