//支付
 $data['appid']='';
 $data['mch_id']='';
 $data['nonce_str']=unicode();
 $data['openid']=$resopenid['openid'];
 $data['check_name']='NO_CHECK';
 $data['amount']='1000';
 $data['desc']='测试审批报销';
 $data['spbill_create_ip']=$_SERVER['SERVER_ADDR'];
 $data['partner_trade_no']=partner_trade_no();
 
 $data['ww_msg_type']='APPROVAL_MSG';
 $data['approval_number']=$datas;
 $data['act_name']='内部报销';
 

//企业支付签名	
$data=array_filter($data);
 ksort($data);
 $str_a='';
 foreach($data as $k=>$v){
     
     $str_a.=$k.'='.$v.'&';
 }
  
  $str_a.='key='.'企业secrect';
 $data['workwx_sign']=md5($str_a);

//支付签名
ksort($data);
$str='';
foreach($data as $k=>$v) {
  $str.=$k.'='.$v.'&';
}
$str.='key='.$secrect_key;
$data['sign']=md5($str);
$xml=arraytoxml($data);



// echo $xml;
$url='https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/paywwsptrans2pocket';
$res=curl($xml,$url);
$return=xmltoarray($res);


print_r($return);



// echo getcwd().'/cert/apiclient_cert.pem';die;
function unicode() {
  $str = uniqid(mt_rand(),1);
  $str=sha1($str);
  return md5($str);
}
function arraytoxml($data){
  $str='';
  foreach($data as $k=>$v) {
    $str.='<'.$k.'>'.$v.'';
  }
  $str.='';
  return $str;
}
function xmltoarray($xml) {
   //禁止引用外部xml实体
  libxml_disable_entity_loader(true);
  $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
  $val = json_decode(json_encode($xmlstring),true);
  return $val;
}
function curl($param="",$url) {
  $postUrl = $url;
  $curlPost = $param;
  $ch = curl_init();                   //初始化curl
  curl_setopt($ch, CURLOPT_URL,$postUrl);         //抓取指定网页
  curl_setopt($ch, CURLOPT_HEADER, 0);          //设置header
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);      //要求结果为字符串且输出到屏幕上
  curl_setopt($ch, CURLOPT_POST, 1);           //post提交方式
  curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);      // 增加 HTTP Header（头）里的字段
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);    // 终止从服务端进行验证
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
  curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/cert/apiclient_cert.pem'); //这个是证书的位置
  curl_setopt($ch,CURLOPT_SSLKEY,getcwd().'/cert/apiclient_key.pem'); //这个也是证书的位置
  $data = curl_exec($ch);                 //运行curl
  curl_close($ch);
  return $data;
}
    


function curl_get_https($url){    
    $curl = curl_init(); // 启动一个CURL会话
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_HEADER, 0);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); // 跳过证书检查
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true);  // 从证书中检查SSL加密算法是否存在
    $tmpInfo = curl_exec($curl);     //返回api的json对象
    //关闭URL请求
    curl_close($curl);    
    return $tmpInfo;    //返回json对象
}






function partner_trade_no(){
    return date('Ymd').substr(implode(NULL, array_map('ord', str_split(substr(uniqid(), 7, 13), 1))), 0, 8);
}

返回错误

Array( [return_code] => SUCCESS [return_msg] => Array ( )

[appid] => wwb455222360fa49c5 [mch_id] => 1226827102 [device_info] => Array ( )

[nonce_str] => c48014c9ce1284348e741ec7b128f2b9 [result_code] => FAIL [err_code] => WORKWX_SIGN_ERROR [err_code_des] => Array ( )