PHP数组大小比较与区间校验：如何高效验证数组元素是否落在指定区间之外？

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


function compareArrays($arr1, $arr2) {
    // 检查区间有效性
    foreach ($arr2 as $interval) {
        if ($interval[0] >= $interval[1]) {
            return "Error: Invalid interval found in arr2.";
        }
    }

    // 检查区间互斥性
    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.";
            }
        }
    }

    // 检查区间不相交性
    foreach ($arr1 as $num) {
        foreach ($arr2 as $interval) {
            if ($num >= $interval[0] && $num <= $interval[1]) {
                return "Error: Element $num from arr1 falls within an interval in arr2.";
            }
        }
    }

    return "No errors found.";
}

echo compareArrays($arr1, $arr2); // 输出错误信息，因为区间重叠且元素落在区间内

$arr2_correct = [[12, 15], [16, 23], [29, 33]]; //修正后的$arr2
echo compareArrays($arr1, $arr2_correct); // 输出 "No errors found."  (如果$arr1和$arr2_correct没有冲突)

?>