<?php
require_once("./function.php");
$url = \'http://\'.$_SERVER[\'HTTP_HOST\'].$_SERVER[\'REQUEST_URI\'].\'?pid=x\';
$getuserinfo = getuserinfo($url);
print_r($getuserinfo);//可以看到获取的用户信息
?>

function getuserinfo($url){
		require_once("./oauth.php");
		$wechat = new Wechat();
		
		if(isset($_GET[\'param\']) && isset($_GET[\'code\'])){

			$get = $_GET[\'param\'];
			$code = $_GET[\'code\'];
			if($get==\'access_token\' && !empty($code)){
				$json = $wechat->get_access_token($code);
				if(!empty($json)){
					$userinfo = $wechat->get_user_info($json[\'access_token\'],$json[\'openid\']);
					return $userinfo;
				}
			}

		}else{
			// $url = \'http://\'.$_SERVER[\'HTTP_HOST\'].\'/activity/childrenday/index.php?pid=x\';
			$wechat->get_authorize_url($url.\'&param=access_token\',\'STATE\');
		}
		
}

<?php
class Wechat {
    
    //高级功能-》开发者模式-》获取
    private $app_id = \'wx123456789\';//服务号appid
    private $app_secret = \'833134#$%^&*($%^&*$%^&*\';//服务号密匙
 
 
    /**
     * 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);
        $url =  "https://open.weixin.qq.com/connect/oauth2/authorize?appid={$this->app_id}&redirect_uri={$redirect_uri}&response_type=code&scope=snsapi_userinfo&state={$state}#wechat_redirect";
		echo "<script language=\'javascript\' type=\'text/javascript\'>";  
        echo "window.location.href=\'$url\'";  
        echo "</script>";  
    }
    
    /**
     * 获取授权token
     * 
     * @param string $code 通过get_authorize_url获取到的code
     */
    public function get_access_token($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=\'post\', $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);
    }
 
}

?>