环境是:
yii2-authclient weibo.upload接口感谢思路/点拨, 这个问题应该不限定在yii2框架内.
接口文档：
pic 类型: binary 描述: 要上传的图片，仅支持jpeg、gif、png格式，图片大小小于5m。
我的代码:
public function sendupload($text, $url){ return $this->api('2/statuses/upload.json', 'post', [ 'status' => $text, 'visible' => self::visible_all, 'pic' => '@'.$url, 'source' => $this->source, ]);}

执行后返回的错误:
{error:unsupport mediatype (application/x-www-form-urlencoded),error_code:10007,request:/2/statuses/upload.json}

微博提供的演示代码:
function upload( $status, $pic_path, $lat = null, $long = null ){ $params = array(); $params['status'] = $status; $params['pic'] = '@'.$pic_path; if ($lat) { $params['lat'] = floatval($lat); } if ($long) { $params['long'] = floatval($long); } return $this->oauth->post( 'statuses/upload', $params, true );}

回复内容： 环境是:
yii2-authclient weibo.upload接口感谢思路/点拨, 这个问题应该不限定在yii2框架内.
接口文档：
pic 类型: binary 描述: 要上传的图片，仅支持jpeg、gif、png格式，图片大小小于5m。
我的代码:
public function sendupload($text, $url){ return $this->api('2/statuses/upload.json', 'post', [ 'status' => $text, 'visible' => self::visible_all, 'pic' => '@'.$url, 'source' => $this->source, ]);}

执行后返回的错误:
{error:unsupport mediatype (application/x-www-form-urlencoded),error_code:10007,request:/2/statuses/upload.json}

微博提供的演示代码:
function upload( $status, $pic_path, $lat = null, $long = null ){ $params = array(); $params['status'] = $status; $params['pic'] = '@'.$pic_path; if ($lat) { $params['lat'] = floatval($lat); } if ($long) { $params['long'] = floatval($long); } return $this->oauth->post( 'statuses/upload', $params, true );}

你需要 multipart/form-data.
具体参考这个 gist