PHP高效处理复杂嵌套数组：以Google Maps API响应为例

// 示例数组结构概览
array(4) {
    ["destination_addresses"]=> array(...) // 目的地地址列表
    ["origin_addresses"]=> array(...)      // 起始地址列表
    ["rows"]=> array(1) {
        [0]=> array(1) {
            ["elements"]=> array(4) {       // 包含每个行程元素的数组
                [0]=> array(3) {
                    ["distance"]=> array(...) // 距离信息
                    ["duration"]=> array(...) // 持续时间信息
                    ["status"]=> string(...)  // 状态
                }
                // ... 其他行程元素
            }
        }
    }
    ["status"]=> string(...) // 整体API状态
}

<?php
// 假设 $destination 变量包含了上述Google Maps API的完整响应数组
// 实际应用中，$destination 会通过 cURL 或其他 HTTP 客户端从 Google Maps API 获取
$destination = array(
    "destination_addresses" => array(
        "Walsall WS2 9PS, UK",
        "Walsall WS2 9PS, UK",
        "Walsall WS2 9PS, UK",
        "Wolverhampton WV10 0QP, UK"
    ),
    "origin_addresses" => array(
        "Stone ST15 0FL, UK"
    ),
    "rows" => array(
        array(
            "elements" => array(
                array(
                    "distance" => array("text" => "41.9 km", "value" => 41947),
                    "duration" => array("text" => "36 mins", "value" => 2134),
                    "status" => "OK"
                ),
                array(
                    "distance" => array("text" => "41.9 km", "value" => 41947),
                    "duration" => array("text" => "36 mins", "value" => 2134),
                    "status" => "OK"
                ),
                array(
                    "distance" => array("text" => "41.9 km", "value" => 41947),
                    "duration" => array("text" => "36 mins", "value" => 2134),
                    "status" => "OK"
                ),
                array(
                    "distance" => array("text" => "40.9 km", "value" => 40924),
                    "duration" => array("text" => "41 mins", "value" => 2458),
                    "status" => "OK"
                )
            )
        )
    ),
    "status" => "OK"
);

foreach( $destination['destination_addresses'] as $idx => $to ) {
    // 检查对应行程元素是否存在且状态是否为 'OK'
    if ( isset($destination['rows'][0]['elements'][$idx]) && $destination['rows'][0]['elements'][$idx]['status'] == 'OK' ) {
        echo '从 ' . $destination['origin_addresses'][0];
        echo ' 到 ' . $to;
        echo ' 距离 ' . $destination['rows'][0]['elements'][$idx]['distance']['text'];
        echo ' 耗时 ' . $destination['rows'][0]['elements'][$idx]['duration']['text'] . PHP_EOL; // 使用 PHP_EOL 替代 </br> 以便在命令行或纯文本中换行
    } else {
        // 处理状态不为 'OK' 或行程信息不存在的情况
        echo '目的地 ' . $to . ' 的行程信息不可用或状态异常。' . PHP_EOL;
    }
}
?>