PHP实现微信网页授权开发教程

微信网页授权是服务号才有的高级功能，开发者可以通过授权后获取用户的基本信息；在此之前，想要获取消息信息只能在用户和公众号交互时根据openid获取用户信息；而微信网页授权可在不需要消息交互，也不需要关注的情况下获取用户的基本信息

微信网页授权时通过OAuth2.0完成的，整个过程分为三步：

用户授权，获取code；
根据code获取access_token【可通过refresh_token刷新获取较长有效期】
通过access_token和openid获取用户信息

对微信网页授权过程做了简单封装：

<?php

/**

• 微信授权相关接口
  */

class Wechat {

//高级功能-》开发者模式-》获取
private $app_id = 'xxx';
private $app_secret = 'xxxxxxx';

/**

• 获取微信授权链接

• @param string $redirect_uri 跳转地址

• @param mixed $state 参数
  */

public function get_authorize_url($redirect_uri = '', $state = '')
{

$redirect_uri = urlencode($redirect_uri);
return "https://open.weixin.qq.com/connect/oauth2/authorize?appid={$this->app_id}&redirect_uri={$redirect_uri}&response_type=code&scope=snsapi_userinfo&state={$state}#wechat_redirect";

}

/**

• 获取授权token

• @param string $code 通过get_authorize_url获取到的code
  */

public function get_access_token($app_id = '', $app_secret = '', $code = '')
{

$token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$this->app_id}&secret={$this->app_secret}&code={$code}&grant_type=authorization_code";
$token_data = $this->http($token_url);
 
if($token_data[0] == 200)
{
  return json_decode($token_data[1], TRUE);
}
 
return FALSE;

}

/**

• 获取授权后的微信用户信息

• @param string $access_token

• @param string $open_id
  */

public function get_user_info($access_token = '', $open_id = '')
{

if($access_token && $open_id)
{
  $info_url = "https://api.weixin.qq.com/sns/userinfo?access_token={$access_token}&openid={$open_id}&lang=zh_CN";
  $info_data = $this->http($info_url);
   
  if($info_data[0] == 200)
  {
    return json_decode($info_data[1], TRUE);
  }
}
 
return FALSE;

}

public function http($url, $method, $postfields = null, $headers = array(), $debug = false)
{

$ci = curl_init();
/* Curl settings */
curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ci, CURLOPT_TIMEOUT, 30);
curl_setopt($ci, CURLOPT_RETURNTRANSFER, true);

switch ($method) {
  case 'POST':
    curl_setopt($ci, CURLOPT_POST, true);
    if (!empty($postfields)) {
      curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields);
      $this->postdata = $postfields;
    }
    break;
}
curl_setopt($ci, CURLOPT_URL, $url);
curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ci, CURLINFO_HEADER_OUT, true);

$response = curl_exec($ci);
$http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);

if ($debug) {
  echo "=====post data======\r\n";
  var_dump($postfields);

  echo '=====info=====' . "\r\n";
  print_r(curl_getinfo($ci));

  echo '=====$response=====' . "\r\n";
  print_r($response);
}
curl_close($ci);
return array($http_code, $response);

}

}