微信小程序实现人脸检测功能

//获取access_token 
function request_post($url = '', $param = '') { 
  if (empty($url) || empty($param)) { 
    return false; 
  } 
   
  $postUrl = $url; 
  $curlPost = $param; 
  $curl = curl_init();//初始化curl 
  curl_setopt($curl, CURLOPT_URL,$postUrl);//抓取指定网页 
  curl_setopt($curl, CURLOPT_HEADER, 0);//设置header 
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);//要求结果为字符串且输出到屏幕上 
  curl_setopt($curl, CURLOPT_POST, 1);//post提交方式 
  curl_setopt($curl, CURLOPT_POSTFIELDS, $curlPost); 
  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE); 
  curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE); 
  curl_setopt($curl, CURLOPT_SSLVERSION, 1); 
  $data = curl_exec($curl);//运行curl 
  curl_close($curl); 
   
  return $data; 
} 
 
function access_token(){ 
  $file= __DIR__ .'\access_token'; 
  if(file_exists($file)){ 
    $str=file_get_contents($file); 
    try{ 
      $arr=json_decode($str,true); 
      if(is_array($arr)){ 
        $totime=$arr['totime']; 
        if($totime>time()){ 
          return $arr['access_token']; 
          exit; 
        } 
      } 
    }catch(Exception $e){ 
 
    } 
  } 
 
  $url = 'https://aip.baidubce.com/oauth/2.0/token'; 
  $post_data['grant_type'] = 'client_credentials'; 
  $post_data['client_id'] = 'fRuY7eOPxBzIHf4qxiYeQOHT'; 
  $post_data['client_secret'] = 'oe7L7aPc5rcKfSewvb5h6xFX2a8dEQN1'; 
  $o = ""; 
  foreach ( $post_data as $k => $v )  
  { 
    $o.= "$k=" . urlencode( $v ). "&" ; 
  } 
  $post_data = substr($o,0,-1); 
   
  $res = request_post($url, $post_data); 
 
  $arr=json_decode($res,true); 
  if(isset($arr['access_token']) && isset($arr['expires_in'])){ 
    $data['access_token'] = $arr['access_token']; 
    $data['totime']= time() + $arr['expires_in'] - 86400; 
    file_put_contents($file, json_encode($data)); 
    return $arr['access_token']; 
  }else{ 
    return false; 
  } 
 
} 

private function init_face(){ 
    $App_ID = '用户appid'; 
    $API_Key = '用户api_key'; 
    $Secret_Key = '用户secret_key'; 
 
    $dir = APP_PATH.'/face-sdk/'; 
    require_once $dir."AipFace.php"; 
    return new \AipFace($App_ID, $API_Key, $Secret_Key); 
}

// 人脸检测 
public function facevalid(){ 
    $file = './Upload/2018-05-17/1.png'; 
    if (!file_exists($file)) { 
      die('文件不存在！'); 
    } 
    $image = base64_encode(file_get_contents($file)); 
    $imageType = 'BASE64'; 
    //如果有可选参数 
    $options = array(); 
    $options['max_face_num'] = 2; 
 
    $client = $this->init_face(); 
    $ret = $client->detect($image,$imageType,$options); 
    // print_r($ret); 
    if ($ret['error_code'] == 0) {//有人脸 
      $result = $ret['result']; 
      $face_num = $result['face_num']; 
 
      if ($face_num==1) { //人脸数量为1 
        $face_probability = $result['face_list'][0]['face_probability']; 
        if ($face_probability==1) { //可靠性为1 
          $user_id = myguid(); 
          $group_id = $this->face_group(); 
          $res = $client->addUser($image,'BASE64',$group_id,$user_id); 
          // print_r($res); 
          if ($res['error_code']==0) { 
            echo "人脸检测完成，并入库"; 
          }           
        }else{ 
          die('可靠性为：'.$face_probability); 
        } 
      }else{ 
        die('人脸数大于1'); 
      } 
    }else{ 
      die('没有人脸'); 
    } 
 
  } 
  // 获取组 
  private function face_group(){ 
    $groupname = '10001'; 
    $client = $this->init_face(); 
    $ret = $client->getGroupList(); 
    if ($ret['error_code'] == 0) { 
      $grouplist = $ret['result']['group_id_list']; 
      if (in_array($groupname, $grouplist)) { 
        return $groupname; 
      }else{ 
        $ret = $client->groupAdd($groupname); 
        if ($ret['error_code'] == 0) { 
          return $groupname; 
        }else{ 
          return false; 
        } 
      } 
    }else{ 
      return false; 
    } 
}