Question

我尝试用php代码解析json变量。问题是一些数组键包含每次迭代的可变值。顺便说一下，这不是一个重复的问题，没有像json解析变量的变量。这是我的json示例和php代码，也是输出;

{
    "link":"",
    "host":"stream",
    "filename":"Rock Ballads The Best Of 70-90's",
    "icon":"https:\/\/i.ytimg.com\/vi\/JN80ayCfmW0\/hqdefault.jpg",
    "streaming":{
        "audio track in mp3 (54.54MB)":"http:\/\/server.example.parsing.com\/str\/wlqcjv8246\/Rock+Ballads+The+Best+Of+70-90%26%23039%3Bs%28p%29.mp3",
        "360p video in mp4 (80.04MB)":"http:\/\/server.example.parsing.com\/str\/wlqcjyfc33\/Rock+Ballads+The+Best+Of+70-90%26%23039%3Bs%28480p%29.mp4",
        "240p video in mp4 (76.55MB)":"http:\/\/server.example.parsing.com\/str\/wlqck18b72\/Rock+Ballads+The+Best+Of+70-90%26%23039%3Bs%28240p%29.mp4",
        "144p video in mp4 (71.09MB)":"http:\/\/server.example.parsing.com\/str\/wlqck4e410\/Rock+Ballads+The+Best+Of+70-90%26%23039%3Bs%28144p%29.mp4"
    },
    "nb":0,
    "error":"",
    "paws":false
}

这是我使用的php代码;

if($host=="www.youtube.com"){
    $decodeProcess = json_decode($output,true);
    echo ($decodeProcess['filename']);
    echo ($decodeProcess['icon']);
    echo ($decodeProcess['streaming']['audio track in mp3 (54.54MB)']);

}

在这种情况下，文件名和图标效果很好，但＆＃34;音频曲目在mp3（54.54MB）＆＃34;或＆＃34; 144p视频在mp4（71.09MB）＆＃34;我解析是有问题的，因为每次文件大小都会改变。我能做什么？

Answer 1

您是否考虑在数据结构上运行简单的映射操作以使其更加可行（基本上从键中删除文件大小信息）？

这可能看起来像：

if($host=="www.youtube.com"){
    $decodeProcess = json_decode($output,true);
    // array of prefix matches that will be used as as substitution keys
    $key_replacements = [
        'audio' => 'audio',
        '360p video' => 'video_360p',
        '240p video' => 'video_240p',
        '144p video' => 'video_144p'
    ];
    foreach($decodeProcess['streaming'] as $key => $value) {
        foreach ($key_replacements as $prefix => $replacement) {
            if (strpos($key, $prefix) === 0) {
                $decodeProcess['streaming'][$replacement] = $value;
                break;
            }
        }
        unset($decodeProces['streaming'][$key]);
    }

    echo ($decodeProcess['filename']);
    echo ($decodeProcess['icon']);
    echo ($decodeProcess['streaming']['audio']);
    echo ($decodeProcess['streaming']['video_360p']);
}

当然，您可能希望将整个JSON反序列化和键映射功能封装到自己的函数或类方法中。

解析JSON使用可变密钥

1 个答案: