如何将多次API请求结果合并为单个PHP数组？

我通过以下方式多次调用API：

foreach ($pickResults as $data) {
    $api = Http::asForm()->post('https://www.pxxxxxxx.com/apis/xxxxxx', [
        'query' => $data,
    ]);
}

每次API调用返回的结果格式如下：

{
  "query": "on the server to successfully complete the installation if you want to update the laravel framework you may issue the php composer",
  "totalMatches": 2,
  "websites": [
    {
      "title": "How to setup laravel framework in wampserver properly?",
      "desc": "3.1. Open a command-line interface (cmd). 3.2. Go to the directory in which you want to install Laravel. This is usually your development directory. In this tutorial, we’ll use C:\\wamp\\www\\laravel. 3.3. Instruct Composer to install Laravel into a project directory. We use project name myproject.",
      "url": "https://stackoverflow.com/questions/20984148/how-to-setup-laravel-framework-in-wampserver-properly"
    },
    {
      "title": "Installation - Laravel - The PHP Framework For Web Artisans",
      "desc": "Laravel is a PHP web application framework with expressive, elegant syntax. We’ve already laid the foundation — freeing you to create without sweating the small things.",
      "url": "https://laravel.com/docs/4.2"
    }
  ]
}

我需要将所有API返回的结果合并成一个一维数组，格式如下：

[{
"title": "",
"desc": "",
"url": ""
},
{
"title": "",
"desc": "",
"url": ""
},
{
"title": "",
"desc": "",
"url": ""
}]

我尝试了以下代码，但得到的是多维数组，不是目标格式：

$response = array();
foreach ($pickResults as $data) {
    $api = Http::asForm()->post('https://www.pxxxxxxx.com/apis/xxxxxx', [
        'query' => $data,
    ]);
    $response[] = $api["websites"];
}

请问该如何解决？

你当前的代码是把每个API返回的websites数组直接追加到$response里，所以会形成多维数组（$response的每个元素都是一个数组）。要合并成一维数组，需要把websites里的每个元素单独整合到总结果中，以下是两种可行的实现方式：

方式一：遍历子数组逐个追加 #

修改代码，在获取到$api["websites"]后，再遍历这个子数组，把每个站点元素单独添加到$response：

$response = array();
foreach ($pickResults as $data) {
    $api = Http::asForm()->post('https://www.pxxxxxxx.com/apis/xxxxxx', [
        'query' => $data,
    ]);
    // 遍历当前API返回的站点列表，逐个追加到总结果
    foreach ($api["websites"] as $site) {
        $response[] = $site;
    }
}

方式二：用array_merge合并数组 #

如果$api["websites"]是索引数组，可以用array_merge直接将当前站点数组与总数组合并：

$response = array();
foreach ($pickResults as $data) {
    $api = Http::asForm()->post('https://www.pxxxxxxx.com/apis/xxxxxx', [
        'query' => $data,
    ]);
    // 合并当前站点数组到总结果
    $response = array_merge($response, $api["websites"]);
}

这两种方式都能得到你需要的一维数组，第一种逻辑更直观，第二种适合处理纯索引数组的场景。

内容的提问来源于stack exchange，提问作者Benny