php获取微信openid方法总结

<?php
/**
* 微信授权相关接口
* 
* @link http://www.phpddt.com
*/
class Wchat
{
private $app_id = 'wx444444444444';
private $app_secret = '77777777';
private $state='aaaa';
/**
* 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={$state}#wechat_redirect";
}
/**
* 获取微信openid
*/
public function getOpenid($turl)
{
if (!isset($_GET['code'])){
//触发微信返回code码
$url=$this- get_authorize_url($turl, $this- state);
Header("Location: $url");
exit();
} else {
//获取code码，以获取openid
$code = $_GET['code'];
$access_info = $this- get_access_token($code);
return $access_info;
}
}
/**
* 获取授权token网页授权
* 
* @param string $code 通过get_authorize_url获取到的code
*/
public function get_access_token($code = '')
{
$appid=$this- app_id;
$appsecret=$this- app_secret;
$token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=".$appsecret."&code=".$code."&grant_type=authorization_code";
//echo $token_url;
$token_data = $this- http($token_url);
// var_dump( $token_data);
if($token_data[0] == 200)
{
$ar=json_decode($token_data[1], TRUE);
return $ar;
}
return $token_data[1];
}
public function http($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 ($debug) {
echo "=====post data======rn";
var_dump($postfields);
echo '=====info=====' . "rn";
print_r(curl_getinfo($ci));
echo '=====$response=====' . "rn";
print_r($response);
}
curl_close($ci);
return array($http_code, $response);
}
}
? 

$openid=isset($_COOKIE['openid'])?$_COOKIE['openid']:'';
if(empty($openid))
{
$wchat=new wchat();
$t_url='http://'.$_SERVER['HTTP_HOST'].'/user.php?act=register';
$info=$wchat- getOpenid($t_url);
if($info){
$openid=$info['openid'];
setcookie('openid',$openid,time()+86400*30);  
}
}