fission-weChat/lib/common/weixin_public.class.php

<?php
/**
 * 微信支付服务器端下单
 * 微信APP支付文档地址:  https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=8_6
 * 使用示例
 *  构造方法参数
 *      'appid'     =>  //填写微信分配的公众账号ID
 *      'mch_id'    =>  //填写微信支付分配的商户号
 *      'notify_url'=>  //填写微信支付结果回调地址
 *      'key'       =>  //填写微信商户支付密钥
 *  );
 *  统一下单方法
 *  $WechatAppPay = new wechatAppPay($options);
 *  $params['body'] = '商品描述';                   //商品描述
 *  $params['out_trade_no'] = '1217752501201407';   //自定义的订单号，不能重复
 *  $params['total_fee'] = '100';                   //订单金额 只能为整数 单位为分
 *  $params['trade_type'] = 'APP';                  //交易类型 JSAPI | NATIVE |APP | WAP
 *  $wechatAppPay->unifiedOrder( $params );
 */
class weixin_public
{

    private $appid;
    private $seceret;
    private $uri;

    public function __construct($appid, $seceret, $uri)
    {
        $this->appid = $appid;
        $this->seceret = $seceret;
        $this->uri = $uri;
    }

    //获取code
    public function redirectWithCode()
    {
        $url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$this->appid
            ."&redirect_uri=".urlencode($this->uri)
            ."&response_type=code&scope=snsapi_userinfo&state=".time()."#wechat_redirect";

        return $url;
    }

    private function getAcessTokenAndOpenId($code)
    {
        $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$this->appid
            ."&secret=".$this->seceret."&code=".$code."&grant_type=authorization_code";

        return file_get_contents($url);
        //return json_decode($jsonInfo, true); //接受一个 JSON 格式的字符串并且把它转换为 PHP 变量
    }

    public function getAllInfo($code)
    {
        $info = self::getAcessTokenAndOpenId($code);

        return $info;

        if (empty($info['access_token']) || empty($info['openid'])) {
            return $info;
        }

        $url = "https://api.weixin.qq.com/sns/userinfo?access_token=".$info['access_token']."&openid=".$info['openid']."&lang=zh_CN";
        $jsonInfo = file_get_contents($url);
        //$jsonInfo = iconv('ISO-8859-1', 'UTF-8', $jsonInfo);
        $ret = json_decode($jsonInfo, true); //接受一个 JSON 格式的字符串并且把它转换为 PHP 变量
        return $ret;
    }


}