/**
* 生成支付代码
* @param   array   $order  订单信息
* @param   array   $payment    支付方式信息
*/
function paypal($arr)
{
   //沙箱https://www.sandbox.paypal.com/cgi-bin/webscr     hermione@hogwarts.com
    //https://www.paypal.com/cgi-bin/webscr
   $goUrl='你的域名/en-us/User/index.html';//请求的整个网址
   $checkurl = '你的域名/en-us/Pay/paypalrespons.html';
   $def_url  = '<br /><form class="paypalform"  action="https://www.paypal.com/cgi-bin/webscr" method="post" >' .   // 不能省略
       "<input type='hidden' name='cmd' value='_xclick'>" .                             // 不能省略
       "<input type='hidden' name='business' value='你的帐号'>" . // 贝宝帐号
       "<input type='hidden' name='item_name' value='{$arr['orderid']}'>" . // 订单号
       "<input type='hidden' name='amount' value='{$arr['money_all']}'>" .// 订单金额
       "<input type='hidden' name='currency_code' value='USD'>" . // 货币
       "<input type='hidden' name='return' value='{$checkurl}'>" .// 付款后页面
       "<input type='hidden' name='invoice' value='{$arr['id']}'>" . // 订单id号
       "<input type='hidden' name='charset' value='utf-8'>" .// 字符集
       "<input type='hidden' name='no_shipping' value='5'>" .// 不要求客户提供收货地址
       "<input type='hidden' name='no_note' value=''>" .//付款说明
       "<input type='hidden' name='notify_url' value='{$goUrl}'>" .
       "<input type='hidden' name='rm' value='2'>" .
       "<input type='hidden' name='cancel_return' value='{$goUrl}'>" .
       "<input type='submit' value='paymengt'>" .// 按钮
       "</form><br />";

   return $def_url;
}

/**
* 支付完成后paypal同步通知页面，返回的数据格式如下，可以用来做相关业务操作
*/
public function paypalrespons(){
   
   /**
    * Array
          (
              [mc_gross] => 645.00
              [invoice] => 62
              [protection_eligibility] => Eligible
              [address_status] => confirmed
              [payer_id] => EXGN523AGY78U
              [tax] => 0.00
              [address_street] => 55 East 52nd Street 21st Floor
              [payment_date] => 23:41:20 May 20, 2016 PDT
              [payment_status] => Completed
              [charset] => utf-8
              [address_zip] => 10022
              [first_name] => Joe
              [mc_fee] => 19.01
              [address_country_code] => US
              [address_name] => Alegra Valava
              [notify_version] => 3.8
              [custom] =>
              [payer_status] => verified
              [business] => hermione@hogwarts.com
              [address_country] => United States
              [address_city] => New York
              [quantity] => 1
              [payer_email] => joe@boe.com
              [verify_sign] => AiPC9BjkCyDFQXbSkoZcgqH3hpacAJsBJMy0YgkcY8Gikt5RDV-9Ty.B
              [txn_id] => 31843824BT0138336
              [payment_type] => instant
              [last_name] => Boe
              [address_state] => NY
              [receiver_email] => hermione@hogwarts.com
              [payment_fee] => 19.01
              [receiver_id] => SFP5SC9MD29XQ
              [txn_type] => web_accept
              [item_name] => 20160521123325183
              [mc_currency] => USD
              [item_number] =>
              [residence_country] => US
              [test_ipn] => 1
              [handling_amount] => 0.00
              [transaction_subject] =>
              [payment_gross] => 645.00
              [shipping] => 0.00
              [merchant_return_link] => click here
              [auth] => AP0Wf6tkagmR93ogjWuE7PHv1W4WJ6NXm-G-Oz7YxaUP3CyP.af5sWV2.Qt-c5xPOg6.s08WZuDfHqFJ0Lpt-qA
          )
    */

｝