Php生成微信小程序二维码的方法

首先创建一个php文件：

<?php
header("Access-Control-Allow-Origin: *");
header('content-type:text/html;charset=utf-8');
//配置小程序APPID、APPSECRET
$APPID = "wx77b333333338eb"; 
$APPSECRET =  "6c33f144444444448c6423366633e4"; 
//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 = 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"];
 }

 $code = $_GET['code'];

//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";
$param = json_encode(array("path"=>"pages/ads/index?code=$code","width"=> 150));
//POST参数
$result = httpRequest( $qcode, $param,"POST");
//生成二维码
file_put_contents("qrcode.png", $result);
$base64_image ="data:image/jpeg;base64,".base64_encode( $result );

$jsons = [
  'code'=>0,
  'data'=>"<img src='$base64_image' />"
];
echo json_encode($jsons);

//把请求发送到微信服务器换取二维码
  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;
  } 
?>

调用此方法

	var url = 'https://www.h5.org.cn/eq.php?code=<?php echo $keyid; ?>';

	A(url,{},function(data){
		console.log(data)
		$('#eq').html(data.data); // 返回的就是 img 图片标签
		lun()
	})