微信登陆

index.php

<?php
//echo $wechat->getUserData();
header('location:https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx40ebdcf2ab048c9c&redirect_uri=http://tina.love5211314.xin/indexLogin.php&response_type=code&scope=snsapi_userinfo&state=123&connect_redirect=1#wechat_redirect'); 

indexLogin.php

<?php
	$appid = 'wx40ebdcf2ab048c9c'; 
	$secretid = '';
	$code = $_GET['code'];
	
	//获取access_token
	function get_access_token($appid,$secretid,$code)
	{
		$json = file_get_contents('https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$secretid.'&code='.$code.'&grant_type=authorization_code');
		$data = json_decode($json,true);
		//echo "<pre>";
		//var_dump($data);
		if(array_key_exists('errcode',$data) && $data['errcode']!=0){
			return $data['errcode']."请检查";
		}
		$access_token = $data['access_token'];
		//设置缓存文件名
		$cacheFile = "access_token";
		//执行缓存
		cacheSet($cacheFile,$access_token,7200);
		return $access_token;
	}
	//echo get_access_token($appid,$secretid,$code);
	//设置缓存
	function cacheSet($path,$data,$expire = 7200)
	{
		//缓存时间
		$expire = sprintf("%010d",$expire);
		$data = "<?php\n//".$expire.serialize($data)."\n?>";
		return file_put_contents($path, $data);

	}

	//获取用户信息
	//https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN 
	 function get_userinfo($appid,$secretid,$code)
	 {
	 	$access_token = get_access_token($appid,$secretid,$code);
	 	echo $access_token;
	 	$json = file_get_contents('https://api.weixin.qq.com/sns/userinfo?access_token='.$access_token.'&openid='.$appid.'&lang=zh_CN');
	 	$userInfo = json_decode($json,true);
	 	echo "<pre>";
	 	var_dump($userInfo);
	 	$url = $userInfo['headimgurl'];
	 	$img = file_get_contents($url);
	 	$fileName = $userInfo['openid'];
	 	file_put_contents('/home/wwwroot/default/weixin_login/down/'.$fileName.'.png',$img);
	 }
	get_userinfo($appid,$secretid,$code);