使用PHP在JSON中搜索值

$jsonData = '{"name": "John", "age": 30, "city": "New York"}';
$data = json_decode($jsonData, true);

function searchValueInArray($array, $value, $parentKey = '') {
    foreach ($array as $key => $val) {
        if ($val === $value) {
            return ($parentKey !== '') ? $parentKey . ' -> ' . $key : $key;
        }
        if (is_array($val)) {
            $result = searchValueInArray($val, $value, ($parentKey !== '') ? $parentKey . ' -> ' . $key : $key);
            if ($result !== false) {
                return $result;
            }
        }
    }
    return false;
}

$result = searchValueInArray($data, "John");
echo $result;