最近公司业务涉及到小程序的二维码分享,看了网上好多教程,不是很完善,有很多坑,所以这里我来实现一下完整的流程。
微信官方说明
官网的地址链接https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/qr-code.html
官方有三个接口如下:
- 接口 A: 适用于需要的码数量较少的业务场景https://developers.weixin.qq.com/miniprogram/dev/api/open-api/qr-code/createWXAQRCode.html
- 接口B: 适用于需要的码数数量极多的业务场景https://developers.weixin.qq.com/miniprogram/dev/api/open-api/qr-code/getWXACode.html
- 接口C: 适用于需要的码数量较少的业务场景https://developers.weixin.qq.com/miniprogram/dev/api/open-api/qr-code/createWXAQRCode.html
PHP代码实现
首先先实现公共函数,如下:
private function httpRequest($url, $data='', $method='GET'){
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($curl, CURLOPT_AUTOREFERER, 1);
if($method=='POST')
{
curl_setopt($curl, CURLOPT_POST, 1);
if ($data != '')
{
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
}
}
curl_setopt($curl, CURLOPT_TIMEOUT, 30);
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);
return $result;
}
接下来实现调用公共方法生成二维码
public function createQrCode(){
header('content-type:text/html;charset=utf-8');
//配置APPID、APPSECRET
$APPID = config('wechat.mini_program.default.app_id');
$APPSECRET = config('wechat.mini_program.default.secret');
//获取access_token
$access_token = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$APPID&secret=$APPSECRET";
//缓存access_token
// session_start();
$_SESSION['access_token'] = "";
$_SESSION['expires_in'] = 0;
$ACCESS_TOKEN = "";
if(!isset($_SESSION['access_token']) || (isset($_SESSION['expires_in']) && time() > $_SESSION['expires_in']))
{
$json = $this->httpRequest( $access_token );
$json = json_decode($json,true);
// var_dump($json);
$_SESSION['access_token'] = $json['access_token'];
$_SESSION['expires_in'] = time()+7200;
$ACCESS_TOKEN = $json["access_token"];
}
else{
$ACCESS_TOKEN = $_SESSION["access_token"];
}
//构建请求二维码参数
//path是扫描二维码跳转的小程序路径,可以带参数?id=xxx
//width是二维码宽度
$qcode ="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=$ACCESS_TOKEN";
$url = env("APP_URL")."/api/login";
$param = json_encode(array("path"=> $url,"width"=> 150));
//POST参数
$result = $this->httpRequest( $qcode, $param,"POST");
//生成二维码
file_put_contents("qrcode.png", $result);
$base64_image ="data:image/jpeg;base64,".base64_encode($result);
}
到这里调用createQrCode这个方法,就会生成Base64的码,接下来只需要转码保存二维码就行。
完整代码如下:
public function createQrCode(){
header('content-type:text/html;charset=utf-8');
//配置APPID、APPSECRET
$APPID = config('wechat.mini_program.default.app_id');
$APPSECRET = config('wechat.mini_program.default.secret');
//获取access_token
$access_token = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$APPID&secret=$APPSECRET";
//缓存access_token
// session_start();
$_SESSION['access_token'] = "";
$_SESSION['expires_in'] = 0;
$ACCESS_TOKEN = "";
if(!isset($_SESSION['access_token']) || (isset($_SESSION['expires_in']) && time() > $_SESSION['expires_in']))
{
$json = $this->httpRequest( $access_token );
$json = json_decode($json,true);
// var_dump($json);
$_SESSION['access_token'] = $json['access_token'];
$_SESSION['expires_in'] = time()+7200;
$ACCESS_TOKEN = $json["access_token"];
}
else{
$ACCESS_TOKEN = $_SESSION["access_token"];
}
//构建请求二维码参数
//path是扫描二维码跳转的小程序路径,可以带参数?id=xxx
//width是二维码宽度
$qcode ="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=$ACCESS_TOKEN";
$url = env("APP_URL")."/api/login";
$param = json_encode(array("path"=> $url,"width"=> 150));
//POST参数
$result = $this->httpRequest( $qcode, $param,"POST");
//生成二维码
file_put_contents("qrcode.png", $result);
$base64_image ="data:image/jpeg;base64,".base64_encode($result);
$imageName = "25220_".date("His",time())."_".rand(1111,9999).'.png';
if (strstr($base64_image,",")){
$base64_image = explode(',',$base64_image);
$base64_image = $base64_image[1];
}
$path = "C:/Users/Administrator/Desktop/develop/testing-backend/".date("Ymd",time());
if (!is_dir($path)){ //判断目录是否存在 不存在就创建
mkdir($path,0777,true);
}
$imageSrc= $path."/". $imageName; //图片名字
$r = file_put_contents($imageSrc, base64_decode($base64_image));//返回的是字节数
if (!$r) {
$tmparr1=array('data'=>null,"code"=>1,"msg"=>"图片生成失败");
echo json_encode($tmparr);
}else{
$tmparr2=array('data'=>1,"code"=>0,"msg"=>"图片生成成功");
echo json_encode($tmparr2);
}
}
//把请求发送到微信服务器换取二维码
private function httpRequest($url, $data='', $method='GET'){
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($curl, CURLOPT_AUTOREFERER, 1);
if($method=='POST')
{
curl_setopt($curl, CURLOPT_POST, 1);
if ($data != '')
{
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
}
}
curl_setopt($curl, CURLOPT_TIMEOUT, 30);
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);
return $result;
}
这是去看图片保存的文件里是否有这个
不错成功生成了。
注意:在获取二维码时,需要post向接口提交数据,只是说返回的是object。没有直接在文件中说明提交的post数据也需要是json对象。发送的既然不是数组,那么在curl请求就不能写成
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($post))
必须写成
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);