微信接口的sign算法

本文已参与「新人创作礼」活动，一起开启掘金创作之路。

    //作用：生成签名
//以交互数据为例
<?php
/**
 * Created by PhpStorm.
 * User: zhaoxinglu
 * Date: 2018/12/14
 * Time: 14:08
 */
namespace App\Http\Controllers;


class CxorderController extends Controller
{
    public $key  = '192006250b4c09247ec02edce69f6a2d';//注：key为商户平台设置的密钥key

    public function test(){
        /*
        ： wxd930ea5d5a258f4f
        mch_id： 10000100
        device_info： 1000
        body： test
        nonce_str： ibuaiVcKdpRxkhJA
          */
        //以交互数据为例
        $data = [
            'appid'=>'wxd930ea5d5a258f4f',
            'mch_id'=>'10000100',
            'device_info'=>'1000',
            'body'=>'test',
            'nonce_str'=>'ibuaiVcKdpRxkhJA'
        ];
        $obj = $this->arrayTransitionObject($data);
        $res = $this->getSign($obj);
        echo $res;
        exit;


    }
    private function getSign($Obj) {
        foreach ($Obj as $k => $v) {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);

        //签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $this->key;
        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
        return $result_;
    }

    ///作用：格式化参数，签名过程需要使用
    private function formatBizQueryParaMap($paraMap, $urlencode) {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar='';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
    protected function arrayTransitionObject(Array $array)
    {
        if (is_array($array)) {
            $obj = new class{};
            foreach ($array as $key => $val) {
                $obj->$key = $val;
            }
        } else {
            $obj = $array;
        }
        return $obj;
    }
    }

////////////////////////////////////////////////////////////// 微信xml与数组互转

    /**
     * XML编码
     * @param mixed $data 数据
     * @param string $root 根节点名
     * @param string $item 数字索引的子节点名
     * @param string $attr 根节点属性
     * @param string $id   数字索引子节点key转换的属性名
     * @param string $encoding 数据编码
     * @return string
     */
    public function xml_encode($data, $root='xml', $item='item', $attr='', $id='id', $encoding='utf-8') {
        if(is_array($attr)){
            $_attr = array();
            foreach ($attr as $key => $value) {
                $_attr[] = "{$key}=\"{$value}\"";
            }
            $attr = implode(' ', $_attr);
        }
        $attr   = trim($attr);
        $attr   = empty($attr) ? '' : " {$attr}";
        $xml   = "<{$root}{$attr}>";
        $xml   .= self::data_to_xml($data, $item, $id);
        $xml   .= "</{$root}>";
        return $xml;
    }
    /**
     * 数据XML编码
     * @param mixed $data 数据
     * @return string
     */
    public static function data_to_xml($data) {
        $xml = '';
        foreach ($data as $key => $val) {
            is_numeric($key) && $key = "item id=\"$key\"";
            $xml    .=  "<$key>";
            $xml    .=  ( is_array($val) || is_object($val)) ? self::data_to_xml($val)  : self::xmlSafeStr($val);
            list($key, ) = explode(' ', $key);
            $xml    .=  "</$key>";
        }
        return $xml;
    }


    public static function xmlSafeStr($str)
    {
        return '<![CDATA['.preg_replace("/[\\x00-\\x08\\x0b-\\x0c\\x0e-\\x1f]/",'',$str).']]>';
    }
    
    function xmlToArray($xml) {
        $arr = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $arr;
    }


    /**
     * POST 请求
     * @param string $url
     * @param array $param
     * @return string content
     */
    function http_post($url,$param){
        $oCurl = curl_init();
        if(stripos($url,"https://")!==FALSE){
            curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, false);
        }
        if (is_string($param)) {
            $strPOST = $param;
        } else {
            $aPOST = array();
            foreach($param as $key=>$val){
                $aPOST[] = $key."=".urlencode($val);
            }
            $strPOST =  join("&", $aPOST);
        }
        curl_setopt($oCurl, CURLOPT_URL, $url);
        curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1 );
        curl_setopt($oCurl, CURLOPT_POST,true);
        curl_setopt($oCurl, CURLOPT_POSTFIELDS,$strPOST);
        $sContent = curl_exec($oCurl);
        $aStatus = curl_getinfo($oCurl);
        curl_close($oCurl);
        if(intval($aStatus["http_code"])==200){
            return $sContent;
        }else{
            return false;
        }
    }

}

    
	///////////////////////////////////////////////////
	    //数组转换成xml
    private function arrayToXml($arr) {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</xml>";
        //echo $xml;exit;
        return $xml;
    }


    //xml转换成数组
    private function xmlToArray($xml) {

        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
        $val = json_decode(json_encode($xmlstring), true);
        return $val;
    }