本文實例講述了微信開放平臺移動應用集成微信支付功能。分享給大家供大家參考。具體分析如下：

WechatAppPay文件代碼如下：

代碼如下:

namespace common\services\WechatPay;

class WechatAppPay extends WechatPayBase

{

//package參數

public $package = [];

//異步通知參數

public $notify = [];

//推送預支付訂單參數

protected $config = [];

//存儲access token和獲取時間的文件

protected $file;

//access token

protected $accessToken;

//取access token的url

const ACCESS_TOKEN_URL = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s';

//生成預支付訂單提交地址

const POST_ORDER_URL = 'https://api.weixin.qq.com/pay/genprepay?access_token=%s';

public function __construct()

{

$this->file = __DIR__ . '/payAccessToken.txt';

}

/**

* 創建APP支付最終返回參數

* @throws \Exception

* @return multitype:string NULL

*/

public function createAppPayData()

{

$this->generateConfig();

$prepayid = $this->getPrepayid();

try{

$array = [

'appid' => $this->appid,

'appkey' => $this->paySignkey,

'noncestr' => $this->getRandomStr(),

'package' => 'Sign=WXPay',

'partnerid' => $this->partnerId,

'prepayid' => $prepayid,

'timestamp' => (string)time(),

];

$array['sign'] = $this->sha1Sign($array);

unset($array['appkey']);

} catch(\Exception $e) {

throw new \Exception($e->getMessage());

}

return $array;

}

/**

* 驗證支付成功后的通知參數

*

* @throws \Exception

* @return boolean

*/

public function verifyNotify()

{

try{

$staySignStr = $this->notify;

unset($staySignStr['sign']);

$sign = $this->signData($staySignStr);

return $this->notify['sign'] === $sign;

} catch(\Exception $e) {

throw new \Exception($e->getMessage());

}

}

/**

* 魔術方法，給添加支付參數進來

*

* @param string $name 參數名

* @param string $value 參數值

*/

public function __set($name, $value)

{

$this->$name = $value;

}

/**

* 設置access token

* @param string $token

* @throws \Exception

* @return boolean

*/

public function setAccessToken()

{

try{

if(!file_exists($this->file) || !is_file($this->file)) {

$f = fopen($this->file, 'a');

fclose($f);

}

$content = file_get_contents($this->file);

if(!empty($content)) {

$info = json_decode($content, true);

if( time() - $info['getTime'] < 7150 ) {

$this->accessToken = $info['accessToken'];

return true;

}

}

//文件內容為空或access token已失效，重新獲取

$this->outputAccessTokenToFile();

} catch(\Exception $e) {

throw new \Exception($e->getMessage());

}

return true;

}

/**

* 寫入access token 到文件

* @throws \Exception

* @return boolean

*/

protected function outputAccessTokenToFile()

{

try{

$f = fopen($this->file, 'wb');

$token = [

'accessToken' => $this->getAccessToken(),

'getTime' => time(),

];

flock($f, LOCK_EX);

fwrite($f, json_encode($token));

flock($f, LOCK_UN);

fclose($f);

$this->accessToken = $token['accessToken'];

} catch(\Exception $e) {

throw new \Exception($e->getMessage());

}

return true;

}

/**

* 取access token

*

* @throws \Exception

* @return string

*/

protected function getAccessToken()

{

$url = sprintf(self::ACCESS_TOKEN_URL, $this->appid, $this->appSecret);

$result = json_decode( $this->getUrl($url), true );

if(isset($result['errcode'])) {

throw new \Exception("get access token failed:{$result['errmsg']}");

}

return $result['access_token'];

}

/**

* 取預支付會話標識

*

* @throws \Exception

* @return string

*/

protected function getPrepayid()

{

$data = json_encode($this->config);

$url = sprintf(self::POST_ORDER_URL, $this->accessToken);

$result = json_decode( $this->postUrl($url, $data), true );

if( isset($result['errcode']) && $result['errcode'] != 0 ) {

throw new \Exception($result['errmsg']);

}

if( !isset($result['prepayid']) ) {

throw new \Exception('get prepayid failed, url request error.');

}

return $result['prepayid'];

}

/**

* 組裝預支付參數

*

* @throws \Exception

*/

protected function generateConfig()

{

try{

$this->config = [

'appid' => $this->appid,

'traceid' => $this->traceid,

'noncestr' => $this->getRandomStr(),

'timestamp' => time(),

'package' => $this->generatePackage(),

'sign_method' => $this->sign_method,

];

$this->config['app_signature'] = $this->generateSign();

} catch(\Exception $e) {

throw new \Exception($e->getMessage());

}

}

/**

* 生成package字段

*

* 生成規則:

* 1、生成sign的值signValue

* 2、對package參數再次拼接成查詢字符串，值需要進行urlencode

* 3、將sign=signValue拼接到2生成的字符串后面得到最終的package字符串

*

* 第2步urlencode空格需要編碼成%20而不是+

*

* RFC 1738會把 空格編碼成+

* RFC 3986會把空格編碼成%20

*

* @return string

*/

protected function generatePackage()

{

$this->package['sign'] = $this->signData($this->package);

return http_build_query($this->package, '', '&', PHP_QUERY_RFC3986);

}

/**

* 生成簽名

*

* @return string

*/

protected function generateSign()

{

$signArray = [

'appid' => $this->appid,

'appkey' => $this->paySignkey,

'noncestr' => $this->config['noncestr'],

'package' => $this->config['package'],

'timestamp' => $this->config['timestamp'],

'traceid' => $this->traceid,

];

return $this->sha1Sign($signArray);

}

/**

* 簽名數據

*

* 生成規則:

* 1、字典排序，拼接成查詢字符串格式，不需要urlencode

* 2、上一步得到的字符串最后拼接上key=paternerKey

* 3、MD5哈希字符串并轉換成大寫得到sign的值signValue

*

* @param array $data 待簽名數據

* @return string 最終簽名結果

*/

protected function signData($data)

{

ksort($data);

$str = $this->arrayToString($data);

$str .= "&key={$this->partnerKey}";

return strtoupper( $this->signMd5($str) );

}

/**

* sha1簽名

* 簽名規則

* 1、字典排序

* 2、拼接查詢字符串

* 3、sha1運算

*

* @param array $arr

* @return string

*/

protected function sha1Sign($arr)

{

ksort($arr);

return sha1( $this->arrayToString($arr) );

}

}

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