### [关于微信支付小程序v3【附PHP完整后端代码】](https://www.prosaas.cn/article/16394)

**Published:** 2021-07-15T05:44:39

**Author:** 5201314

**Excerpt:** 微信支付 小程序 （v3）- PHP 完整后端代码踩坑太多，不多说，直接上完整后端代码 查询订单是否支付完成 …

微信支付 小程序 （v3）- PHP 完整后端代码

# **踩坑太多，不多说，直接上完整后端代码**

<?php
header('Content-type:text/html; Charset=utf-8');
ini\_set('date.timezone','Asia/Shanghai');
$data\_s = file\_get\_contents('php://input');
$data\_s = json\_decode($data\_s,true);
//统一下单
function wechartAddOrder($name,$ordernumber,$money,$openid,$timeStamp,$noncestr){
    $url = "https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi";
    $urlarr = parse\_url($url);
    $appid = '小程序APPID';//appID
    $mchid = '微信支付商户ID';//商户ID
    $xlid = '微信支付公钥序列号';//秘钥序列号 可在这个网址中查询 https://myssl.com/cert\_decode.html
    $data = array();
    $time = $timeStamp;
    $data\['appid'\] = $appid;
    $data\['mchid'\] = $mchid;
    $data\['description'\] = $name;//商品描述
    $data\['out\_trade\_no'\] = $ordernumber;//订单编号
    $data\['notify\_url'\] = "你的域名/你的支付目录路径/notify.php";//回调接口 需根据自己的情况修改
    $data\['amount'\]\['total'\] = intval($money \* 1);//金额 单位 分
    $data\['payer'\]\['openid'\] = $openid;//用户openID
    $data = json\_encode($data); 
    $key = getSign($data,$urlarr\['path'\],$noncestr,$time);//签名
    $token = sprintf('mchid="%s",serial\_no="%s",nonce\_str="%s",timestamp="%d",signature="%s"',$mchid,$xlid,$noncestr,$time,$key);//头部信息

    $header  = array(
        'Content-Type:'.'application/json; charset=UTF-8',
        'Accept:application/json',
        'User-Agent:\*/\*',
        'Authorization: WECHATPAY2-SHA256-RSA2048 '.$token
    );  
    $ret = curl\_post\_https($url,$data,$header);
    $ret = ltrim($ret,'{"prepay\_id":"');
    $ret = rtrim($ret,'}"');
    //微信支付（小程序）签名
    $str = getWechartSign($appid,$timeStamp,$noncestr,'prepay\_id='.$ret);
    $arr = array('appid'=>$appid,'timestamp'=>$timeStamp,'package'=>'prepay\_id='.$ret,'paySign'=>$str);
    exit(json\_encode($arr));
}
$set\_body = '支付测试';//支付显示内容
$price = '1';//支付金额
$out\_trade\_no = $data\_s\['out\_trade\_no'\];//订单号
$timeStamp = $data\_s\['timeStamp'\];//时间戳
$openid = $data\_s\['openid'\];
$noncestr = $data\_s\['nonceStr'\];

wechartAddOrder($set\_body,$out\_trade\_no,$price,$openid,$timeStamp,$noncestr);


//微信支付签名
function getSign($data=array(),$url,$randstr,$time){
    $str = "POST"."\\n".$url."\\n".$time."\\n".$randstr."\\n".$data."\\n";
    $key = file\_get\_contents('apiclient\_key.pem');//在商户平台下载的秘钥
    $str = getSha256WithRSA($str,$key);
    return $str;
}

//调起支付的签名
function getWechartSign($appid,$timeStamp,$noncestr,$prepay\_id){
    $str = $appid."\\n".$timeStamp."\\n".$noncestr."\\n".$prepay\_id."\\n";
    $key = file\_get\_contents('apiclient\_key.pem');
    $str = getSha256WithRSA($str,$key);
    return $str;
}

function getSha256WithRSA($content, $privateKey){
    $binary\_signature = "";
    $algo = "SHA256";
    openssl\_sign($content, $binary\_signature, $privateKey, $algo);
    $sign = base64\_encode($binary\_signature);
    return $sign;
}

/\* PHP CURL HTTPS POST \*/
function curl\_post\_https($url,$data,$header){ // 模拟提交数据函数
    $curl = curl\_init(); // 启动一个CURL会话
    curl\_setopt($curl, CURLOPT\_URL, $url); // 要访问的地址
    curl\_setopt($curl, CURLOPT\_SSL\_VERIFYPEER, 0); // 对认证证书来源的检查
    curl\_setopt($curl, CURLOPT\_SSL\_VERIFYHOST, 1); // 从证书中检查SSL加密算法是否存在
    curl\_setopt($curl, CURLOPT\_USERAGENT, $\_SERVER\['HTTP\_USER\_AGENT'\]); // 模拟用户使用的浏览器
    curl\_setopt($curl, CURLOPT\_FOLLOWLOCATION, 1); // 使用自动跳转
    curl\_setopt($curl, CURLOPT\_AUTOREFERER, 1); // 自动设置Referer
    curl\_setopt($curl, CURLOPT\_POST, 1); // 发送一个常规的Post请求
    curl\_setopt($curl, CURLOPT\_POSTFIELDS, $data); // Post提交的数据包
    curl\_setopt($curl, CURLOPT\_TIMEOUT, 30); // 设置超时限制防止死循环
    curl\_setopt($curl, CURLOPT\_HEADER, 0); // 显示返回的Header区域内容
    curl\_setopt($curl, CURLOPT\_RETURNTRANSFER, 1); // 获取的信息以文件流的形式返回

    curl\_setopt($curl, CURLOPT\_HTTPHEADER, $header);
    $tmpInfo = curl\_exec($curl); // 执行操作
    if (curl\_errno($curl)) {
        echo 'Errno'.curl\_error($curl);//捕抓异常
    }
    curl\_close($curl); // 关闭CURL会话
    return $tmpInfo; // 返回数据，json格式
}

# 查询订单是否支付完成

header('Content-type:text/html; Charset=utf-8');
ini\_set('date.timezone','Asia/Shanghai');
$data\_s = file\_get\_contents('php://input');
$data\_s = json\_decode($data\_s,true);
if(empty($data\_s\['out\_trade\_no'\])){
    exit;
}

$out\_trade\_no = $data\_s\['out\_trade\_no'\];//订单号
$merchant\_id = '商户ID';//商户ID
$mch\_private\_key = file\_get\_contents('apiclient\_key.pem');//在商户平台下载的秘钥
$xlid = '微信支付公钥序列号';//秘钥序列号 可在这个网址中查询 https://myssl.com/cert\_decode.html

$url = 'https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/'.$out\_trade\_no.'?mchid='.$merchant\_id;
$url\_parts = parse\_url($url);
$http\_method = 'GET';
$timestamp = time();
$nonce = md5(time().$out\_trade\_no);
$body = '';
$canonical\_url = ($url\_parts\['path'\] . (!empty($url\_parts\['query'\]) ? "?${url\_parts\['query'\]}" : ""));
$message =  $http\_method."\\n".
            $canonical\_url."\\n".
            $timestamp."\\n".
            $nonce."\\n".
            $body."\\n";
openssl\_sign($message, $raw\_sign, $mch\_private\_key, 'sha256WithRSAEncryption');
$sign = base64\_encode($raw\_sign);

$schema = 'WECHATPAY2-SHA256-RSA2048';
$token = sprintf('mchid="%s",nonce\_str="%s",timestamp="%d",serial\_no="%s",signature="%s"',$merchant\_id, $nonce, $timestamp, $xlid, $sign);
$header  = array(
    'Content-Type:'.'application/json; charset=UTF-8',
    'Accept:application/json',
    'User-Agent:\*/\*',
    'Authorization: WECHATPAY2-SHA256-RSA2048 '.$token
);  
$ret = curl\_get\_https($url,$data,$header);

$return\_out\_trade\_no = get\_between($ret,'"out\_trade\_no":"','","payer"');
$return\_trade\_state = get\_between($ret,'trade\_state":"','","trade\_state\_desc"');


$arr = array('type'=>'success','trade\_state'=>$return\_trade\_state,'out\_trade\_no'=>$return\_out\_trade\_no);
exit(json\_encode($arr));

/\*
 \* php截取指定两个字符之间字符串
 \* \*/
function get\_between($input, $start, $end) {
 $substr = substr($input, strlen($start)+strpos($input, $start),(strlen($input) - strpos($input, $end))\*(-1));
 return $substr;
}

/\* PHP CURL HTTPS GET \*/
function curl\_get\_https($url,$data,$header){ // 模拟提交数据函数
    $curl = curl\_init(); // 启动一个CURL会话
    curl\_setopt($curl, CURLOPT\_URL, $url); // 要访问的地址
    curl\_setopt($curl, CURLOPT\_USERAGENT, $\_SERVER\['HTTP\_USER\_AGENT'\]); // 模拟用户使用的浏览器
    curl\_setopt($curl, CURLOPT\_FOLLOWLOCATION, 1); // 使用自动跳转
    curl\_setopt($curl, CURLOPT\_AUTOREFERER, 1); // 自动设置Referer
    curl\_setopt($curl, CURLOPT\_TIMEOUT, 30); // 设置超时限制防止死循环
    curl\_setopt($curl, CURLOPT\_HEADER, 0); // 显示返回的Header区域内容
    curl\_setopt($curl, CURLOPT\_RETURNTRANSFER, 1); // 获取的信息以文件流的形式返回
    curl\_setopt($curl, CURLOPT\_HTTPHEADER, $header);// 头部信息
    $tmpInfo = curl\_exec($curl); // 执行操作
    if (curl\_errno($curl)) {
        echo 'Errno'.curl\_error($curl);//捕抓异常
    }
    curl\_close($curl); // 关闭CURL会话
    return $tmpInfo; // 返回数据，json格式
}

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