在json php循环中查找变量

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

foreach ($data as $key => $value) {
    // 在这里进行变量查找操作
}

foreach ($data as $key => $value) {
    if ($key == "name") {
        // 找到了名为"name"的变量
        echo "Name: " . $value;
    }
}

function searchVariable($data, $variableName) {
    foreach ($data as $key => $value) {
        if ($key == $variableName) {
            // 找到了目标变量
            echo "Variable Found: " . $value;
        }
        if (is_array($value) || is_object($value)) {
            // 递归搜索嵌套结构
            searchVariable($value, $variableName);
        }
    }
}

searchVariable($data, "name");