php - 查询错误消息有什么问题 {"errors":["undefined method `tempfile' for \"@/files/media/keywords.csv\":String"]}

Question

我想上传文件，我收到以下错误消息

{"errors":["undefined method tempfile'for\"@/files/media/keywords.csv\":String"]}

这是我的代码

$ch = curl_init(); curl_setopt($ch, CURLOPT_URL,
'https://app.simpli.fi/api/organizations/57979/campaigns/2156268/keywords');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
        
        $post = array(
            'keyword[csv]' => '@' .realpath('./files/media/keywords.csv'),
            'keyword[append]' => 'true'
        );
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
        
        $headers = array();
        $headers[] = 'X-App-Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
        $headers[] = 'X-User-Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        
        $result = curl_exec($ch);
        echo "<pre>";
        print_r($result);
        if (curl_errno($ch)) {
            echo 'Error:' . curl_error($ch);
        }
        curl_close($ch);
        die;