<?php
 
# 微信统一下单接口
$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
 
 
$param = [
 'appid' => '公众号id',
 'mch_id' => '商户id',
 'nonce_str' =>uniqid(),
 'sign_type' => 'MD5',
 'body' => 'test',
 'detail' => 'test detail',
 'out_trade_no' => date('Ymd').rand(10000,99999),
 'total_fee' => 1,
 'notify_url' => 'http://www.test.top/testpay/pay.php',
 'trade_type' =>'JSAPI',
];
 
 
ksort( $param );
 
$sign_str = urldecode(http_build_query( $param ));
 
 
$sign_str .= '&key=商户密钥';
 
 
//echo $sign_str;exit;
 
$sign_str = md5( $sign_str );
 
 
$param['sign'] = strtoupper( $sign_str );
 
function CurlPost($url, $param = [], $is_post = 1, $timeout = 5 )
{
 
 //初始化curl
 $curl = curl_init();
 
 // 设置请求的路径
 curl_setopt($curl, CURLOPT_URL, $url);
 
 if ($is_post == 1) {
  //设置POST提交
  curl_setopt($curl, CURLOPT_POST, 0);
 }
 
 //显示输出结果 1代表 把接口返回的结果当作一个字符串处理
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 
 // 设置请求超时时间
 curl_setopt($curl, CURLOPT_TIMEOUT, $timeout);
 
 curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
 
 
 if ($is_post == 1) {
  //提交数据 -- 设置post提交的数据
  if (is_array($param)) {
 
   //http_build_query
   curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($param));
  } else {
   curl_setopt($curl, CURLOPT_POSTFIELDS, $param);
  }
 }
 
 //执行请求
 $data = $data_str = curl_exec($curl);
 //处理错误
 if ($error = curl_error($curl)) {
  $log_data = array(
   'url' => $url,
   'param' => $param,
   'error' => '<span style="color:red;font-weight: bold">' . $error . '</span>',
  );
 
  var_dump($log_data);
  exit;
 }
 
 # 关闭CURL
 curl_close($curl);
 
 
 //json数据转换为数组
 $data = json_decode($data, true);
 
 if (!is_array($data)) {
  $data = $data_str;
 }
 
 #调用玩接口之后写一个日志
 $log = [
  'url' => $url,
  'param' => $param,
  'response' => $data_str
 ];
 file_put_contents(__DIR__ . '/wechat.log', print_r($log, true), 8);
 
 return $data;
 
}
function arr2Xml( $arr ){
 
 $xml = '<xml version="1.0" encoding="UTF-8"> ';
 foreach( $arr as $key => $value ){
  if (is_numeric($value)){
   $xml.="<".$key.">".$value."</".$key.">";
  }else{
   $xml.="<".$key."><![CDATA[".$value."]]></".$key.">";
  }
 
 }
 $xml .= '</xml>';
 return $xml;
}
 
$xml = arr2Xml( $param );
 
$result = CurlPost( $url , arr2Xml($param) );
 
 
$api_arr = json_decode( json_encode(simplexml_load_string( $result , 'SimpleXMLElement', LIBXML_NOCDATA) ), true );
 
if( $api_arr['return_code'] == 'SUCCESS' ){
 
 include __DIR__ . '/phpqrcode.php';
 header('content-type:image/png');
 echo Qrcode::png( $api_arr['code_url'] , false , 'H' , 6 ,2 );
}

<?php
 
#微信统一下单接口
$url='https://api.mch.weixin.qq.com/pay/unifiedorder';
 
$param=[
 #公众账号ID
 'appid'=>'****',
 'mch_id'=>'***',
 'nonce_str'=>uniqid(),
 'sign_type'=>'MD5',
 'body'=>'test',
 'detail'=>'detail',
 'out_trade_no'=>date('Ymd').rand(10000,99999),
 'total_fee'=>1,
 'spbill_create_ip'=>$_SERVER['SERVER_ADDR'],
 'notify_url'=>'http://****/test.php',
 'trade_type'=>'NATIVE',
];
ksort($param);
 
$sign_str=urldecode(http_build_query($param));
 
$sign_str.='&key=8934e7d15453e97507ef794cf7b0519d';
 
$sign_str=md5($sign_str);
 
$param['sign']=strtoupper($sign_str);
 
//print_r($param);exit;
function CurlPost($url, $param = [], $is_post = 1, $timeout = 5 )
{
 //初始化curl
 $curl = curl_init();
 
 // 设置请求的路径
 curl_setopt($curl, CURLOPT_URL, $url);
 
 if ($is_post == 1) {
  //设置POST提交
  curl_setopt($curl, CURLOPT_POST, 0);
 }
 
 //显示输出结果 1代表 把接口返回的结果当作一个字符串处理
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 
 // 设置请求超时时间
 curl_setopt($curl, CURLOPT_TIMEOUT, $timeout);
 
 curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
 
 
 if ($is_post == 1) {
  //提交数据 -- 设置post提交的数据
  if (is_array($param)) {
 
   //http_build_query
   curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($param));
  } else {
   curl_setopt($curl, CURLOPT_POSTFIELDS, $param);
  }
 }
 
 //执行请求
 $data = $data_str = curl_exec($curl);
 //处理错误
 if ($error = curl_error($curl)) {
  $log_data = array(
   'url' => $url,
   'param' => $param,
   'error' => '<span style="color:red;font-weight: bold">' . $error . '</span>',
  );
 
  var_dump($log_data);
  exit;
 }
 
 # 关闭CURL
 curl_close($curl);
 
 
 //json数据转换为数组
 $data = json_decode($data, true);
 
 if (!is_array($data)) {
  $data = $data_str;
 }
 
 #调用玩接口之后写一个日志
 $log = [
  'url' => $url,
  'param' => $param,
  'response' => $data_str
 ];
 file_put_contents(__DIR__ . '/wechat.log', print_r($log, true), 8);
 
 return $data;
 
}
 
function arrzxml($arr){
 $xml='<xml version="1.0" encoding="UTF-8">';
 foreach($arr as $key=>$value){
  if(is_numeric($value)){
   $xml.="<".$key.">".$value."</".$key.">";
  }else{
   $xml.="<".$key."><![CDATA[".$value."]]></".$key.">";
  }
 
 }
 $xml.='</xml>';
// var_dump($xml);exit;
 return $xml;
 
}
 
$xml=arrzxml($param);
$result=CurlPost($url,arrzxml($param));
//echo '<pre/>';
var_dump($result);
exit;
$api_arr=json_decode(simplexml_load_string($result,'SimpleXMLElement',LIBXML_NOCDATA),true);
if($result['return_code']=='SUCCESS'){
 include __DIR__.'/phpqrcode.php';
 header('content-type:image/png');
 echo Qrcode::png($api_arr['code_url'],false,'H',6,2);
 
}