今天想用php curl上傳檔案到別的伺服器，百度了下找到一個方法，

$ch = curl_init();

$data = array('name' => 'Foo', 'file' => '@/home/vagrant/test.png');

curl_setopt($ch, CURLOPT_URL, 'http://localhost/test/curl/load_file.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

curl_exec($ch);

從 PHP 5.5.0 開始, @

遂使用 CURLFile 類得以解決。

具體實現程式碼如下（我封裝了一個方法來實現）:

/**
 * 上傳頭像
 */
function uploadFace(){
$file = request()->file('file')->getInfo();
if($file){
$upload = array(
'get_name'  => 'file',
'type'  =>  $file['type'],
'name'  
 
=>  $file['name'],
'file'  =>  $file['tmp_name'],
        );
exit(json_encode($this->connect('user/face',
array('username'  => input('username')), 'POST', $upload)));
    }else{
$this->dump('上傳圖片失敗#1');
    }
}

/**
 * 請求資料
 * @param $action
 * @param array $params
 * @param string $type
 
 * @param $upload
 * @return mixed
 */
protected function connect($action, $params = array(), $type = 'POST', $upload = false){
$data = array();
$method = strtoupper($type);
$url = $this->api_url . $action;
$params['api_key'] = $this->api_key;
if($method == 'GET'){
$url = "{$url}?" . http_build_query($params);
    }
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
if($method == 'POST'){
if($upload){        //設定上傳檔案
$file = new \CURLFile($upload['file'], $upload['type'], $upload['name']);
$params[$upload['get_name']] = $file;
        }
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
    }
$result = curl_exec($ch);
curl_close($ch);
if($data === null){
$this->dump('請求資料失敗.', 2);
    }else{
try{
$data = json_decode($result, true);
        }catch(\Exception $e){
$this->dump('parse error.', 2, $e);
        }
    }
return $data;
}

參考文獻: 

http://php.net/manual/zh/class.curlfile.php