CodeIgniter框架集成支付宝即时到账SDK

$config['partner']      = '商户id';
$config['key']          = '商户API key';
$config['seller_email'] = '商户支付宝邮箱账号';
$config['payment_type'] = 1;
$config['transport'] = 'http';
$config['input_charset'] = 'utf-8';
$config['sign_type'] = 'MD5';
$config['notify_url'] = 'http://'.$_SERVER['HTTP_HOST'].'/order/callback/notify';
$config['return_url'] = 'http://'.$_SERVER['HTTP_HOST'].'/order/callback/return';
$config['cacert'] = APPPATH.'third_party/alipay/cacert.pem';

// 订单控制器类
class Order extends CI_Controller{
	// ...
	public function pay($id) {
		// 获取订单数据示例
		$order = $this->model->get($id);

		// 加载支付宝配置
		$this->config->load('alipay', TRUE);
		// 加载支付宝支付请求类库
		require_once(APPPATH."third_party/alipay/alipay_submit.class.php");

		$submit = new AlipaySubmit($this->config->item('alipay'));

		$body = $submit->buildRequestForm(array(
			'service'           => 'create_direct_pay_by_user',
			'partner'           => $this->config->item('partner', 'alipay'),
			'payment_type'      => $this->config->item('payment_type', 'alipay'),
			'notify_url'        => $this->config->item('notify_url', 'alipay'),
			'return_url'        => $this->config->item('return_url', 'alipay'),
			'seller_email'      => $this->config->item('seller_email', 'alipay'),
			'out_trade_no'      => $id,
			'subject'	        => $order['product']['name'],
			'total_fee'         => $order['price'],
			'body'              => $order['product']['name'],
			'show_url'          => 'http://'.$_SERVER['HTTP_HOST'].'/product/view/'.$order['productId'],
			'anti_phishing_key' => '',
			'exter_invoke_ip'   => '',
			'_input_charset'    => $this->config->item('input_charset', 'alipay')
		));

		// 渲染模板，原生的这么写，我自己另外用smarty3
		$this->load->view('pay', array('body' => $body));
	}
	// ...
}

// 还是订单控制器类
class Order extends CI_Controller{
	// $method参数只能是'return'或'notify'，对应URL
	public function callback ($method) {
		// 加载支付宝配置
		$this->config->load('alipay', TRUE);
		// 加载支付宝返回通知类库
		require_once(APPPATH."third_party/alipay/alipay_notify.class.php");
		// 初始化支付宝返回通知类
		$alipayNotify = new AlipayNotify($this->config->item('alipay'));

		$input = array();
		$is_ajax = FALSE;
		$notify_status = 'success';

		// 这里做同步还是异步的判断并获取返回数据验证请求
		switch ($method) {
			case 'notify':
				$result = $alipayNotify->verifyNotify();
				$input = $this->input->post();
				$is_ajax = TRUE;
				break;

			case 'return':
				$result = $alipayNotify->verifyReturn();
				$input = $this->input->get();
				break;
			
			default:
				return $this->out_not_found();
				break;
		}

		// 支付宝返回支付成功和交易结束标志
		if ($result && ($input['trade_status'] == 'TRADE_FINISHED' || $input['trade_status'] == 'TRADE_SUCCESS')) {
			$id = $input['out_trade_no'];

			// 验证成功则更新订单信息（略）
			// ...
		} else {
			// 否则置状态为失败
			$notify_status = 'fail';
		}

		if ($is_ajax) {
			// 异步方式调用模板输出状态
			$this->view->load('alipay', array('status' => $notify_status));
		} else {
			// 同步方式跳转到订单详情控制器，redirect方法要你自己写
			return $this->redirect("order/view/$id#status:$notify_status");
		}
	}
}

$ sudo apt-get install curl php5-curl

function paraFilter($para) {
	$para_filter = array();
	// 问题就在这
	while (list ($key, $val) = each ($para)) {
		if($key == "sign" || $key == "sign_type" || $val == "")continue;
		else	$para_filter[$key] = $para[$key];
	}
	return $para_filter;
}

function paraFilter($para) {
	// 增加这一行
	reset($para);
	$para_filter = array();
	while (list ($key, $val) = each ($para)) {
		if($key == "sign" || $key == "sign_type" || $val == "")continue;
		else	$para_filter[$key] = $para[$key];
	}
	return $para_filter;
}