官方给的php代码如下：

    $host = "https://ali-deliver.showapi.com";$path = "/showapi_expInfo";$method = "GET";$appcode = "你自己的AppCode";$headers = array();array_push($headers, "Authorization:APPCODE " . $appcode);$querys = "com=zhongtong&nu=535962308717&receiverPhone=receiverPhone&senderPhone=senderPhone";$bodys = "";$url = $host . $path . "?" . $querys;$curl = curl_init();curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $method);curl_setopt($curl, CURLOPT_URL, $url);curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);curl_setopt($curl, CURLOPT_FAILONERROR, false);curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);curl_setopt($curl, CURLOPT_HEADER, true);if (1 == strpos("$".$host, "https://")){curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);}var_dump(curl_exec($curl));

我写的代码如下：

// 查看物流信息接口
// $lo_num物流单号，$ename物流公司英文简写
public function see_wulius($lo_num,$ename){$host = "https://ali-deliver.showapi.com";$path = "/showapi_expInfo";$method = "GET";$appcode = "be817881f15540abd3015830f45318fd";$headers = array();array_push($headers, "Authorization:APPCODE " . $appcode);$querys = "com=".$ename."&nu=".$lo_num;$bodys = "";$url = $host . $path . "?" . $querys;$curl = curl_init();curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $method);curl_setopt($curl, CURLOPT_URL, $url);curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);curl_setopt($curl, CURLOPT_FAILONERROR, false);curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);curl_setopt($curl, CURLOPT_HEADER, false);if (1 == strpos("$".$host, "https://")){curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);}curl_setopt($curl, CURLOPT_POSTFIELDS, $bodys);return (curl_exec($curl));
}

注意 curl_setopt($curl, CURLOPT_HEADER, false); 这里应该用false，不要包体头，这样才会返回json格式数据。如果按照官方给的文档这里是true的话，返回结果是字符串。

为了减少用户请求，我没有采用缓存，而是直接存入数据库，这样永久保留数据，什么时候都可以查看物流信息。每次查看物流的时候先判断该表有没有这个物流信息，没有就调接口查询然后存进来，有的话根据状态和过期时间判断是否需要重新请求接口，请求一次接口就更新一次数据，过期时间也更新。