微信公众号生成带参数二维码 与 扫描二维码获取到参数

获取access_token

$appId = $this->appId;
$appSecret = $this->appSecret;

$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appId&secret=$appSecret";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);
$json_info = json_decode($output, true);
$access_token = $json_info["access_token"];

生成二维码

官方文档

// 生成二维码参数
$id = "";
$postData = [
	'action_name' => 'QR_LIMIT_STR_SCENE', // 二维码类型，QR_SCENE为临时的整型参数值，QR_STR_SCENE为临时的字符串参数值，QR_LIMIT_SCENE为永久的整型参数值，QR_LIMIT_STR_SCENE为永久的字符串参数值
	'action_info' => [
		'scene' => [
			'scene_str' => $id // 场景值
		]
	]
];

$postData = json_encode($postData);

$qrcodeUrl = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token={$access_token}";
$ch = curl_init($qrcodeUrl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
'Content-Type: application/json'
]);
$response = curl_exec($ch);
curl_close($ch);

$responseData = json_decode($response, true);
$ticket = $responseData['ticket'];

// 获取二维码图片
$qrcodeUrl = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket={$ticket}";
$qrcodeResponse = file_get_contents($qrcodeUrl);

// 保存二维码图片
$qrcodeFile = $id . '.png';

file_put_contents($qrcodeFile, $qrcodeResponse);

扫描二维码

扫描二维码之后，微信会将二维码的场景值回调到，填写的服务器地址URL中

服务端代码

// 微信回调的场景XML数据
$wechat_xml = file_get_contents('php://input');

// 服务器配置中的 令牌（Token）
$token = '';

$data = $this->request->get();
$data['signature'] = $data['signature'];
$data['timestamp'] = $data['timestamp'];
$data['nonce'] = $data['nonce'];
$data['echostr'] = $data['echostr'];

$tmpArr = array($token, $timestamp, $nonce);
sort($tmpArr, SORT_STRING);
$tmpStr = implode($tmpArr);
$tmpStr = sha1($tmpStr);

// 。。。。。。

/**
 * 可以选择在这里，对接收到的二维码参数，进行处理
 */

// 。。。。。。。

if ($tmpStr == $signature) {
    return $data['echostr'];
} else {
    return false;
}

如果扫描二维码在公众号聊天记录中出现【该公众号提供的服务出故障，请稍后再试】，请检查是否开启debug模式，关掉后等待片刻再试。仅针对ThinkPHP，其他框架请自行测试