通过 Curl/PHP 查询 API

Question

我正在查看 Parse.com REST API 并使用 PHP 使用的 Curl 包装器进行调用。

原始卷曲代码（有效）：

curl -X GET \
  -H "X-Parse-Application-Id: myApplicationID" \
  -H "X-Parse-REST-API-Key: myRestAPIKey" \
  https://api.parse.com/1/classes/Steps

PhP 代码（有效）：

$ch = curl_init('https://api.parse.com/1/classes/Steps');

curl_setopt($ch,CURLOPT_HTTPHEADER,array('X-Parse-Application-Id: myApplicationID',
    'X-Parse-REST-API-Key: myRestAPIKey',
    'Content-Type: application/json'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_exec($ch);
curl_close($ch);

这很好，但现在当我尝试添加查询约束时：

原始卷曲代码（有效）：

curl -X GET \
  -H "X-Parse-Application-Id: myApplicationID" \
  -H "X-Parse-REST-API-Key: myRestAPIKey" \
  -G \
--data-urlencode 'where={"steps":9243}' \
https://api.parse.com/1/classes/Steps

唉，我们最终得到了我的问题——上述代码的 php 模拟是什么？

PHP 代码（不起作用）：

$ch = curl_init('https://api.parse.com/1/classes/Steps');

$query = urlencode('where={"steps":9243}');

curl_setopt($ch,CURLOPT_HTTPHEADER,array('X-Parse-Application-Id: myApplicationID',
    'X-Parse-REST-API-Key: myRestAPIKey',
    'Content-Type: application/json'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $query);

curl_exec($ch);
curl_close($ch);

错误响应：

Object ( [code] => 107 [error] => invalid json: where%3D%7B%22steps%22%3A9243%7D )

Answer 1

您的上一个 PHP 示例已将请求从 GET 更改为 POST。在查询字符串而不是 POST 正文中传递您的参数。试试：

$query = urlencode('where={"steps":9243}');
$ch = curl_init('https://api.parse.com/1/classes/Steps?'.$query);

curl_setopt(
    $ch, 
    CURLOPT_HTTPHEADER,
    array(
        'X-Parse-Application-Id: myApplicationID',
        'X-Parse-REST-API-Key: myRestAPIKey',
        'Content-Type: application/json'
    )
);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_exec($ch);
curl_close($ch);

Answer 2

为了调用 GET,POST,DELETE,PUT 各种请求，我创建了一个通用函数

define("SITEURL", "http://localhost:82/slimdemo/RESTAPI");

function CallAPI($method, $api, $data, $headers) {
    $url = SITEURL . "/" . $api;
    $curl = curl_init($url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);

    switch ($method) {
        case "GET":
            curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "GET");
            break;
        case "POST":
            curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
            break;
        case "PUT":
            curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "PUT");
            break;
        case "DELETE":
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "DELETE"); 
            curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
            break;
    }
    $response = curl_exec($curl);
    $data = json_decode($response);

    /* Check for 404 (file not found). */
    $httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
    // Check the HTTP Status code
    switch ($httpCode) {
        case 200:
            $error_status = "200: Success";
            return ($data);
            break;
        case 404:
            $error_status = "404: API Not found";
            break;
        case 500:
            $error_status = "500: servers replied with an error.";
            break;
        case 502:
            $error_status = "502: servers may be down or being upgraded. Hopefully they'll be OK soon!";
            break;
        case 503:
            $error_status = "503: service unavailable. Hopefully they'll be OK soon!";
            break;
        default:
            $error_status = "Undocumented error: " . $httpCode . " : " . curl_error($curl);
            break;
    }
    curl_close($curl);
    echo $error_status;
    die;
}

调用 DeleteAPI

$data = array('id'=>$_GET['did']);
$header = array('USERTOKEN:' . GenerateToken());
$result = CallAPI('DELETE', "DeleteCategory", $data, $header);

调用 PostAPI

$data = array('title'=>$_POST['txtcategory'],'description'=>$_POST['txtdesc']);
$header = array('USERTOKEN:' . GenerateToken());
$result = CallAPI('POST', "InsertCategory", $data, $header);

调用 GetAPI

$data = array('id'=>$_GET['eid']);
$header = array('USERTOKEN:' . GenerateToken());
$result = CallAPI('GET', "GetCategoryById", $data, $header);

调用 PutAPI

$data = array('id'=>$_REQUEST['eid'],m'title'=>$_REQUEST['txtcategory'],'description'=>$_REQUEST['txtdesc']);
$header = array('USERTOKEN:' . GenerateToken());
$result = CallAPI('POST', "UpdateCategory", $data, $header);

Answer 3

这一行：

curl_setopt($ch, CURLOPT_POSTFIELDS, $query);

正在尝试设置对 GET 请求无效的请求正文。 cURL 似乎允许您在 GET 请求 (example) 上设置正文。

您的 PHP 似乎没有发出 POST 请求（至少我可以通过查看其他使用 curl_setopt($ch,CURLOPT_POST, count($fields)); 的 PHP 示例来判断。我相信您需要将数组传递给 postfields 选项：

$fields = array(
    'where' => urlencode('{"steps":9243}')
);

curl_setopt($ch, CURLOPT_POST, count($fields));
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);

Answer 4

试试这个：

$query = json_encode(
    array(
        'where' => array( 'steps' => 9243 )
    )
);

我从here 收集到了这个——虽然没有测试！ Python 示例在发送查询之前似乎对查询进行了 JSON 编码，因此可能值得尝试。