/*** 微信公众平台操作类*/
class WeChat {private $_appid;private $_appsecret;public function __construct($id,$secret){$this->_appid = $id;$this->_appsecret = $secret;}/*** 获取 access_tonken* @param  string $token_file,用来存在token的临时文件*/public function getAccessToken($token_file="./access_tonken"){//考虑过期实际，获取的access_token存储到某个文件中$life_time = 7200;if(file_exists($token_file) && time()-filemtime($token_file)<$life_time){//存在有效的access_token$str = file_get_contents($token_file);return $str;}//目标url$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={$this->_appid}&secret={$this->_appsecret}";//向url发送get请求$result = $this->_requestGet($url);if(!$result){return false;}//存在返回响应的结果$result_obj = json_decode($result,true);//写入file_put_contents($token_file, $result_obj['access_token']);return $result_obj['access_token'];}/*** 发送GET请求的方法* @param string $url URL* @param bool $ssl 是否为https协议* @return string 响应主体Content*/public function _requestGet($url,$ssl=true){//curl完成$curl = curl_init();//设置curl选项curl_setopt($curl, CURLOPT_URL, $url);//请求代理信息$user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "Mozilla/5.0 (Windows NT 6.1; WOW64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.75 Safari/537.36";curl_setopt($curl, CURLOPT_USERAGENT,$user_agent); //referer头,请求来源curl_setopt($curl, CURLOPT_AUTOREFERER, true);//SSL相关的if($ssl){//禁用后curl将终止从服务端进行验证curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);//检查服务器ssl证书中是否存在一个公用名(commont name)// curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 1);//是否返回响应头curl_setopt($curl, CURLOPT_HEADER, false);//是否返回响应结果curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);//发送请求$response = curl_exec($curl);if (false == $response) {echo "<br />", curl_error($curl),"<br />";return false;}return $response;}}