微信获取openid

<?php

$appid = "wx200ece2d613cc414"; //这里的appid是假的演示用

$redirect_uri = urlencode("http://test.it1000.cc/test.php"); //这里的地址需要http:

$url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" . $appid . "&redirect_uri=" . $redirect_uri . "&response_type=code&scope=snsapi_base&state=123#wechat_redirect";
header('location:' . $url);

<?php

$appid         = "wx200ece2d613cc414";
$secret        = "029daa7ef07c36c4e3b97673f5713d76";
$code          = $_GET["code"];
$get_token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' . $appid . '&secret=' . $secret . '&code=' . $code . '&grant_type=authorization_code';
$ch            = curl_init();
curl_setopt($ch, CURLOPT_URL, $get_token_url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
$res = curl_exec($ch);
curl_close($ch);
$json_obj = json_decode($res, true);
var_dump(json_obj);

这个简易版