PHP cURL，POST JSON

Question

我需要POST以下JSON代码，但由于某种原因它无法正常工作。以下是我的代码。

$fieldString = "395609399";
//the curl request processor
function processCurlJsonrequest($URL, $fieldString) { //Initiate cURL request and send back the result
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HTTPHEADERS, array('Content-Type: application/json'));
    curl_setopt($ch, CURLOPT_URL, $URL);
    curl_setopt($ch, CURLOPT_USERAGENT, $this->_agent);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_COOKIEFILE, $this->_cookie_file_path);
    curl_setopt($ch, CURLOPT_COOKIEJAR, $this->_cookie_file_path);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
    curl_setopt($ch, CURLOPT_VERBOSE, TRUE);
    if ($fieldCount) { // in case of post fields present then pass it on
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode("{categoryId: $fieldString}"));
        curl_setopt($ch, CURLOPT_POST, 1);
    }
    $resulta = curl_exec($ch);
    if (curl_errno($ch)) {
        print curl_error($ch);
    } else {
        curl_close($ch);
    }
    return $resulta;
}

以下是调用cURL请求的函数：

function get_cat($categoryId, $URL) {
    $fields = array(
        "categoryId" => $categoryId
    );
    $fields_string = $fields;
    return $this->processCurlJsonrequest($URL, $fields_string);
}

Answer 1

问题在于：

curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode("{categoryId: $fieldString}"));

CURLOPT_POSTFIELDS将接受参数数组或URL编码的参数字符串：

curl_setopt($ch, CURLOPT_POSTFIELDS, array('json'=>json_encode($stuff)));
curl_setopt($ch, CURLOPT_POSTFIELDS, 'json='.urlencode(json_encode($stuff)));

其中json将是POST字段的名称（即：将导致$_POST['json']可访问）。

Answer 2

发送没有JSON编码的文本，并添加此标题代码：

curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json; charset=utf-8","Accept:application/json, text/javascript, */*; q=0.01")); 

Answer 3

使用最初的示例，工作代码应如下所示：

//the curl request processor
function processCurlJsonrequest($URL, $fieldString) { //Initiate cURL request and send back the result
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
    curl_setopt($ch, CURLOPT_URL, $URL);
    curl_setopt($ch, CURLOPT_USERAGENT, $this->_agent);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_COOKIEFILE, $this->_cookie_file_path);
    curl_setopt($ch, CURLOPT_COOKIEJAR, $this->_cookie_file_path);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
    curl_setopt($ch, CURLOPT_VERBOSE, TRUE);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(array("myJsonData" => "test")));
    curl_setopt($ch, CURLOPT_POST, 1); 
    $resulta = curl_exec($ch);
    if (curl_errno($ch)) {
        print curl_error($ch);
    } else {
        curl_close($ch);
    }
    return $resulta;
}

Answer 4

我在通过cURL发送JSON时出现问题，问题是我没有在标题中明确设置内容长度。

所以标题应该是：

curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Content-Length: ' . strlen($json)));

Answer 5

实际上非常简单，确保为json设置了额外的Content-Type标头集，然后CURLOPT_POSTFIELDS可以将json作为字符串。无需编码。