PHP数组大小比较及区间校验：如何验证一维数组元素是否都在二维数组区间之外？

<?php
$arr1 = [0=>'8',1=>'17',2=>'23',3=>'22',4=>'25',5=>'30',6=>'42'];
$arr2 = [[0=>'12',1=>'15'],[0=>'24',1=>'28'],[0=>'17',1=>'25'],[0=>'29',1=>'33']];

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

    // 检查arr2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 ranges in arr2";
            }
        }
    }

    // 检查arr1元素是否在arr2区间内
    foreach ($arr1 as $value) {
        foreach ($arr2 as $range) {
            if ($value >= $range[0] && $value <= $range[1]) {
                return "Error: arr1 value " . $value . " is within a range in arr2";
            }
        }
    }

    return "All conditions are met";
}

echo checkArrays($arr1, $arr2);
?>