微信开发之生成二维码,扫码关注公众号PHP
使用到微信接口是“生成带参数的二维码”,可以生成两种二维码,一种是临时二维码,会过期,生成量大,主要用于帐号绑定等不要求二维码永久保存的业务场景;另一种是永久二维码,没有过期时间,但生成量小(目前为最多10万个),主要用于适用于帐号绑定、用户来源统计等场景。扫码之后,如果用户没关注公众号会提示关注,如果已关注就直接进入公众号对话框。
首先创建二维码ticket,然后凭借ticket到指定URL换取二维码,具体介绍可以看官方文档 https://developers.weixin.qq.com/doc/offiaccount/Account_Management/Generating_a_Parametric_QR_Code.html
示例代码:
<?php namespace app\index\controller; use think\Controller; /** * 微信类 */ class Wechat extends Controller { protected $APPID = ‘xxxxxxxxxxx‘; protected $APPSECRET = ‘xxxxxxxxxxxxxx‘; /** * curl请求 */ public function http_curl($url, $type = ‘get‘, $res = ‘json‘, $arr = ‘‘){ $cl = curl_init(); curl_setopt($cl, CURLOPT_URL, $url); curl_setopt($cl, CURLOPT_RETURNTRANSFER, 1); curl_setopt($cl, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($cl, CURLOPT_SSL_VERIFYHOST, false); if($type == ‘post‘){ curl_setopt($cl, CURLOPT_POST, 1); curl_setopt($cl, CURLOPT_POSTFIELDS, $arr); } $output = curl_exec($cl); curl_close($cl); return json_decode($output, true); if($res == ‘json‘){ if( curl_error($cl)){ return curl_error($cl); }else{ return json_decode($output, true); } } } /** * 获取 AccessToken */ public function getAccessToken() { $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->APPID."&secret=".$this->APPSECRET; // 先判断 access_token 文件里的token是否过期,没过期继续使用,过期就更新 $data = json_decode($this->get_php_file(ROOT_PATH."public".DS."wxtxt".DS."access_token.txt")); // 过期 更新 if ($data->expire_time < time()) { $res = $this->http_curl($url); $access_token = $res[‘access_token‘]; if ($access_token) { // 在当前时间戳的基础上加7000s (两小时) $data->expire_time = time() + 7000; $data->access_token = $res[‘access_token‘]; $this->set_php_file(ROOT_PATH."public".DS."wxtxt".DS."access_token.txt",json_encode($data)); } }else{ // 未过期 直接使用 $access_token = $data->access_token; } return $access_token; } // 获取存储文件中的token ticket private function get_php_file($filename) { return trim(file_get_contents($filename)); } // 把token ticket 存储到文件中 private function set_php_file($filename, $content) { $fp = fopen($filename, "w"); fwrite($fp, $content); fclose($fp); } /** * 生成二维码 */ public function getQrcode(){ $token = $this->getAccessToken(); $url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=$token"; $param = array(); $param[‘action_name‘] = "QR_LIMIT_SCENE"; $param[‘action_info‘] = array( ‘scene‘ => array( ‘scene_id‘=>‘123‘ ) ); $param = json_encode($param); // 获取二维码的ticket和二维码图片解析地址 $res = $this->http_curl($url, ‘post‘, ‘json‘, $param); // 通过ticket换取二维码 $qrcode = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=".$res[‘ticket‘]; //输出二维码图片路径 echo "<center><img src=".$qrcode."></center>"; } }
运行getQrcode()方法,效果如下
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