<?php
namespace kjpay;

class Kjpay
{
    /**
     * 获取IP地址
     * return ip
     */
    function get_wx_ip(){
        $ip = "unknown";
        if(isset($_SERVER['REMOTE_ADDR'])){
            $ip = $_SERVER['REMOTE_ADDR'];
        }elseif(getenv("REMOTE_ADDR")){
            $ip = getenv("REMOTE_ADDR");
        }elseif(isset($_SERVER['HTTP_CLIENT_IP'])){
            $ip = $_SERVER['HTTP_CLIENT_IP'];
        } elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            $pos = array_search('unknown', $arr);
            if (false !== $pos)
                unset($arr[$pos]);
            $ip = trim($arr[0]);
        }
        return $ip;
    }

    /**
     * 除去数组中的空值和签名参数
     * @param $para 签名参数组
     * return 去掉空值与签名参数后的新签名参数组
     */
    function paraFilters($para) {
        $para_filter = array();
        if($para){
            foreach ($para as $key=>$val){
                if($key == "sign" || $key == "signature" || $val == "")
                    continue;
                else
                    $para_filter[$key] = $para[$key];
            }
        }
        return $para_filter;
    }

    /**
     * 对数组排序
     * @param $para 排序前的数组
     * return 排序后的数组
     */
    function argSorts($para) {
        ksort($para);
        reset($para);
        return $para;
    }

    /**
     * 签名验证-快接支付
     * $datas 数据数组
     * $key 密钥
     */
    function local_sign($datas = array(), $key = ''){
        $str = urldecode(http_build_query($this->argSorts($this->paraFilters($datas))));
        $sign = md5($str."&key=".$key);
        return $sign;
    }

    /**
     * 签名验证-快接支付
     * $datas 数据数组
     * $key 密钥
     */
    function getdata($url, $param){
        $content = '';
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

        curl_setopt($ch, CURLOPT_POSTFIELDS, $param);

        curl_setopt($ch, CURLOPT_TIMEOUT,6);
        $content = curl_exec($ch);

        //如果发现异常，排查下curl错误
        //echo "curl错误：".curl_error($ch);

        curl_close($ch);
        return $content;
    }
}