alipay payment gateway verify

alipay_return_url_checker.php

<?php

  protected function isFromAlipay($notifyId)
    {
        $url = 'https://mapi.alipay.com/gateway.do?service=notify_verify&partner=' . trim(env('ALIPAY_PID')) . '&notify_id=' . $notifyId;

        $response = $this->httpGet($url);

        return (bool) preg_match("/true$/i",$response);
    } 
  
  protected function httpGet($url)
    {
        $curl = curl_init($url);
        curl_setopt($curl, CURLOPT_HEADER, 0 ); // 过滤HTTP头
        curl_setopt($curl,CURLOPT_RETURNTRANSFER, 1);// 显示输出结果
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);//SSL证书认证
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);//严格认证
        curl_setopt($curl, CURLOPT_CAINFO, public_path() . '/cacert.pem');//证书地址
        $response = curl_exec($curl);
        curl_close($curl);

        return $response;
    }