在JSON中查找字符串？[PHP]

<?php
function searchInJSON($json, $target) {
    foreach ($json as $key => $value) {
        if (is_array($value) || is_object($value)) {
            // 递归搜索嵌套的JSON对象或数组
            $result = searchInJSON($value, $target);
            if ($result !== false) {
                return $result;
            }
        } elseif (is_string($value) && $value === $target) {
            // 找到匹配的字符串
            return $key;
        }
    }
    return false; // 未找到目标字符串
}

// 示例JSON数据
$jsonData = '{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York"
    },
    "hobbies": ["reading", "music", "sports"]
}';

// 解析JSON数据
$json = json_decode($jsonData);

// 查找字符串
$target = "New York";
$result = searchInJSON($json, $target);

if ($result !== false) {
    echo "找到目标字符串 \"$target\"，对应的键名为 \"$result\"。";
} else {
    echo "未找到目标字符串 \"$target\"。";
}
?>