1.前期准备
1:申请微信开放平台账号
地址 微信开放平台
2：应用申请完后会获得AppID和AppSecret
3：接下来申请微信支付接口
4：支付接口申请完后微信商户平台会发送一份邮件到您的邮箱，里面有您微信商户平台的账号，密码以及商户号
5：登录微信商户平台
微信商户平台
6：下载安全证书（用于退款等一些需要证书验证的接口使用）
证书下载后，打开压缩包会看到「apiclient_cert.pem」和「apiclient_key.pem」和rootca.pem证书。
7：设置api密钥
2.支付接入
业务流程
简单来说，整个支付流程最主要分为以下几个步骤
统一下单
后台生成支付参数
通过支付参数唤醒支付宝支付
服务端异步回调处理支付结果
1.统一下单
/* 配置参数 */
private $config = array(
'appid' => "", /*微信开放平台上的应用id*/
'mch_id' => "", /*微信申请成功之后邮件中的商户id*/
'api_key' => "", /*在微信商户平台上自己设定的api密钥 32位*/
'notify_url' => '' /*自定义的回调程序地址*/
);
//下单
public function getPrePayOrder($body, $out_trade_no, $total_fee){
$url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
$notify_url = $this->config["notify_url"];
$onoce_str = $this->createNoncestr();
$data["appid"] = $this->config["appid"];
$data["body"] = $body;
$data["mch_id"] = $this->config['mch_id'];
$data["nonce_str"] = $onoce_str;
$data["notify_url"] = $notify_url;
$data["out_trade_no"] = $out_trade_no;
$data["spbill_create_ip"] = $this->get_client_ip();
$data["total_fee"] = $total_fee;
$data["trade_type"] = "APP";
$sign = $this->getSign($data);
$data["sign"] = $sign;
$xml = $this->arrayToXml($data);
$response = $this->postXmlCurl($xml, $url); //将微信返回的结果xml转成数组 $response = $this->xmlToArray($response); if($response['result_code']=='SUCCESS' && $response['return_code']=='SUCCESS'){
$response = $this->getOrder($response['prepay_id']);
return ['code'=>1,'msg'=>'调用成功!','data'=>$response];
}else{
return ['code'=>0,'msg'=>$response['err_code_des']]; } //返回数据 return $response;
}
2:生成随机数
/** * 作用：产生随机字符串，不长于32位 */
public function createNoncestr( $length = 32 ){
$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
$str ="";
for ( $i = 0; $i < $length; $i++ ) {
$str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
}
return $str;
}
3：数组转xml
//数组转xml
public function arrayToXml($arr){
$xml = "";
foreach ($arr as $key=>$val){
if (is_numeric($val)){
$xml.="<".$key.">".$val.""; }else{ $xml.="<".$key.">";
}
}
$xml.="";
return $xml;
}
4:将xml转数组
/** * 作用：将xml转为array */
public function xmlToArray($xml){
//将XML转为array
$array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
return $array_data;
}
5:作用：以post方式提交xml到对应的接口url
public function postXmlCurl($xml,$url,$second=30){
//初始化
curl $ch = curl_init();
//设置超时
curl_setopt($ch, CURLOPT_TIMEOUT, $second);
//这里设置代理，如果有的话
//curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
//curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
//设置header
curl_setopt($ch, CURLOPT_HEADER, FALSE);
//要求结果为字符串且输出到屏幕上
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
//post提交方式
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
//运行curl
$data = curl_exec($ch);
//返回结果
if($data){
curl_close($ch);
return $data;
}else{
$error = curl_errno($ch);
echo "curl出错，错误码:$error"."
";curl_close($ch);
return false;
}
}
6:获取当前服务器的IP
public function get_client_ip(){
if ($_SERVER['REMOTE_ADDR']) {
$cip = $_SERVER['REMOTE_ADDR'];
} elseif (getenv("REMOTE_ADDR")) {
$cip = getenv("REMOTE_ADDR");
} elseif (getenv("HTTP_CLIENT_IP")) {
$cip = getenv("HTTP_CLIENT_IP");
} else {
$cip = "unknown";
}
return $cip;
}
7:格式化参数，签名过程需要使用
public function formatBizQueryParaMap($paraMap, $urlencode){
$buff = "";
ksort($paraMap);
foreach ($paraMap as $k => $v){
if($urlencode){
$v = urlencode($v);
}
$buff .= $k . "=" . $v . "&";
}
if (strlen($buff) > 0){
$reqPar = substr($buff, 0, strlen($buff)-1);
}
return $reqPar;
}
8://执行第二次签名，才能返回给客户端使用
public function getOrder($prepayId){
$data["appid"] = $this->config["appid"];
$data["noncestr"] = $this->createNoncestr(32);
$data["package"] = "Sign=WXPay";
$data["partnerid"] = $this->config['mch_id'];
$data["prepayid"] = $prepayId;
$data["timestamp"] = time();
$s = $this->getSign($data, false);
$data["sign"] = $s;
return $data;
}
9；/*生成签名*/
public function getSign($Obj){
foreach ($Obj as $k => $v){
$Parameters[$k] = $v;
}
//签名步骤一：按字典序排序参数
ksort($Parameters);
$String = $this->formatBizQueryParaMap($Parameters, false);
//echo '【string1】'.$String.'';
//签名步骤二：在string后加入KEY
$String = $String."&key=".$this->config['api_key'];
//echo "【string2】".$String."";
//签名步骤三：MD5加密
$String = md5($String);
//echo "【string3】 ".$String."";
//签名步骤四：所有字符转为大写
$result_ = strtoupper($String);
//echo "【result】 ".$result_."";
return $result_;
}
10:回调，处理后台逻辑
public function wxPayBack(){
$input=file_get_contents("php://input");
$xml=simplexml_load_string($input);
Log::write($input);
$result_code=(string)$xml->result_code;
$out_trade_no=(string)$xml->out_trade_no;
if($result_code=='SUCCESS'){
//订单数据处理
echo "Success";
}else{
echo "Fail";
}