微信二维码付款

$url = $obj->paying($fee,$apiSecret,$trade_no);

<?php
class pay{

public function paying($fee,$apiSecret,$trade_no)
{
$api=\'https://api.mch.weixin.qq.com/pay/unifiedorder\';
//构造参数
$randString=md5(uniqid());
$randOrder=\'000\'.rand(1,1000000);
$data=[
\'appid\'=>\'wxb0e9db1233eeb7b7\',
\'mch_id\'=>\'1435153802\',
\'nonce_str\'=>$randString,
\'body\'=>\'付款\',
\'out_trade_no\'=>$trade_no,
\'total_fee\'=>$fee*100,//单位是分
\'spbill_create_ip\'=>\'127.0.0.1\',//终端ip
\'notify_url\'=>\'http://t.51ao.com/wap/paynotice.php\',//通知地址
//\'notify_url\'=>\'http://t.51ao.com/wap/1.php\',//通知地址
\'trade_type\'=>\'NATIVE\',
];
ksort($data);//以键名排序
$string=\'\';
foreach($data as $k=>$v)
{
    $string.="$k=$v&";
}
//把秘钥连接到参数上
$string.=\'key=\'.$apiSecret;
//把链接的字符串全部大写再MD5加密
$sign=strtoupper(md5($string));
//把参数和签名放到一起
$data[\'sign\']=$sign;
//参数转成xml
$xml=\'<xml>\';
foreach($data as $k=>$v)
{
    $xml.="<$k>$v</$k>";
}
$xml.=\'</xml>\';
//var_dump($xml);

$ret=$this->post($api,$xml);
//解析xml
$xml=simplexml_load_string($ret);
if($xml->return_code==\'SUCCESS\')
{
    //把code_url转化成二维码图片
    // require(\'./phpqrcode.php\');//包含类库文件
    //import(\'source.class.phpqrcode\');
    return $xml->code_url;
    //QRCode::png($xml->code_url);

    }else
    {

        die($xml);
    }
}
// var_dump($ret);

// 发POST请求
public function post1( $url,$xml,$second = 30)
{
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        $data = curl_exec($ch);
        curl_close($ch);

        if ($data) {
            return $data;
        }
        else {
            $error = curl_errno($ch);
            echo \'curl出错，错误码:\' . $error . \'<br>\';
            echo \'<a href=\\'http://curl.haxx.se/libcurl/c/libcurl-errors.html\\'>错误原因查询</a></br>\';
            return false;
        }
 }

public function post($url, $data = \'\', $isHttps = TRUE)
{
    // 创建curl对象
    $ch = curl_init ();
    // 配置这个对象
    curl_setopt ( $ch, CURLOPT_URL, $url);  // 请求的URL地址
    if($isHttps)
    {
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); // 对认证证书来源的检查
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); // 从证书中检查SSL加密算法是否存在
    }
    curl_setopt ( $ch, CURLOPT_POST, 1);  // 是否是POST请求
    curl_setopt ( $ch, CURLOPT_HEADER, 0);  // 去掉HTTP协议头
    curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1);  // 返回接口的结果，而不是输出
    curl_setopt ( $ch, CURLOPT_POSTFIELDS, $data);  // 提交的数据
    // 发出请求
    $return = curl_exec ( $ch );
    // 关闭对象
    curl_close ( $ch );
    // 返回数据
    return $return;
 }
}