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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
  

 <?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 （$debug） {echo "=====post data======
";var_dump（$postfields）; echo "=====info=====" . "
";print_r（curl_getinfo（$ci））; echo "=====$response=====" . "
";print_r（$response）;}curl_close（$ci）;return array（$http_code, $response）;} }