<?php
$url = "https://api.weixin139.com/weixin/domain/auto_check_list?user=xxx&key=xxx&type=1";
$con = get_msg($url);
$data = json_decode($con,true);
$count = count($data)-1;
$rand = rand(0,$count);
echo $data[$rand]['domain'];
function get_msg($url){
 $ch = curl_init();
 curl_setopt($ch,CURLOPT_TIMEOUT,1);
 curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch,CURLOPT_URL,$url);
 curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
 curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);
 $data = curl_exec($ch);
 if($data){
  curl_close($ch);
  return $data;
 }else {
  $error = curl_errno($ch);
  curl_close($ch);
  return false;
 }
}