小程式二維碼生成中的一些坑
阿新 • • 發佈:2018-12-24
小程式二維碼生成介面:https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/qr-code.html
官方提供了三種介面,我這裡使用的是B類介面,遇到的幾個坑都是通用的。
1、access_token應放在url中,不在post傳遞的引數中
在這裡,如果你僅把access_token放在post傳遞的引數中或url和post傳參中都放,會報錯access_token失效或資料格式錯誤
2、scene不能為空,隨意填寫就行,但不能為空
方案一(將二維碼儲存在本地):
public function getQRcode() { $access_token = json_decode(file_get_contents('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.$this->AppID.'&secret='.$this->AppSecret),true)['access_token']; $url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=$access_token"; $ch = curl_init(); $data = json_encode(['scene' => 'test']); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_HEADER, 'image/gif'); curl_setopt($ch, CURLOPT_URL,$url); curl_setopt($ch, CURLOPT_POSTFIELDS,$data); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);//跳過ssl檢測 curl_setopt($ch, CURLOPT_HTTPHEADER, array( 'Content-Type: application/json', 'Content-Length: ' . strlen($data) )); curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); //如果需要將結果直接返回到變數裡,那加上這句。 $res = curl_exec($ch); file_put_contents('test.png',$res); $this->smarty_lib->tmp("getQRcode.html",''); }
方案二(直接渲染):
public function getQRcode() { $access_token = json_decode(file_get_contents('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.$this->AppID.'&secret='.$this->AppSecret),true)['access_token']; $url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=$access_token"; $ch = curl_init(); $data = json_encode(['scene' => 'test']); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_HEADER, 'image/gif'); curl_setopt($ch, CURLOPT_URL,$url); curl_setopt($ch, CURLOPT_POSTFIELDS,$data); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch, CURLOPT_HTTPHEADER, array( 'Content-Type: application/json', 'Content-Length: ' . strlen($data) )); curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); //如果需要將結果直接返回到變數裡,那加上這句。 $res = curl_exec($ch); $data = 'data:image/jpeg;base64,'.base64_encode($res);//補全base64加密字串頭 $html = "<!DOCTYPE html> <html lang='en'> <head> <meta charset='UTF-8'> <title>二維碼</title> </head> <body> <img src='$data'> </body> </html>"; echo $html; exit; }
- note:微信介面返回的是二進位制圖片,所以需要先處理一番再渲染