Recently, I came into contact with the development of WeChat Public Number. First of all, I climbed this pit about custom menu and saw the document for a while plus Baidu's summary of the implementation methods
The code above shows that I used my own access token directly, which I implemented according to my own token.The acquisition of appid and appsercet is not explained here, it will not be directly Baidu.Below is a simple way to implement the menu. You can encapsulate a lot of functions yourself. Refer to the WeChat development documentation for details.Attach your own picture at the end

<?php
//WeChat Custom Menu

header("Content-type: text/html; charset=utf-8");

//define("ACCESS_TOKEN", "5b9FZhqOXvEf2GthK76FF03kio0uUST9uqUT9L3mLli1qKdPp4dF7Ik0ZiKLGlWs4DQHMB-IveCgNvxEuDlMIrqloxrXa1IaYy5cGB3Gp9TvP_Yh-o1H-bi8Nq9BXE3JMAUbADACQK");`

function get_access_token() {

$appid = "Your WeChat Public Number appid";
$appsecret = "Your WeChat Public Number appsercet";
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$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);
$jsoninfo = json_decode($output, true);
$access_token = $jsoninfo["access_token"];
return $access_token;

}

//Create menu
function createMenu($data) {

$access_token = get_access_token();
var_dump($access_token);
if (!$access_token)
    return;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=" . $access_token);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$tmpInfo = curl_exec($ch);
if (curl_errno($ch)) {
    return curl_error($ch);
}

curl_close($ch);
return $tmpInfo;

}

//Get Menu
function getMenu() {

return file_get_contents("https://api.weixin.qq.com/cgi-bin/menu/get?access_token=" . ACCESS_TOKEN);

}

//Delete menu
function deleteMenu() {

return file_get_contents("https://api.weixin.qq.com/cgi-bin/menu/delete?access_token=" . ACCESS_TOKEN);

}

$data = '{

 "button":[
  {
       "name":"Security Dynamics",
       "sub_button":[
       {
           "type":"click",
           "name":"One sentence a day",
           "key":"V1001_GOOD"
        },
        {
           "type":"click",
           "name":"Security Notification",
           "key":"V1001_GOOD"
        },
        {
           "type":"click",
           "name":"Important Notice",
           "key":"V1001_GOOD"
        },
        {
           "type":"click",
           "name":"Exchange of experience",
           "key":"V1001_HELLO_WORLD"
        },
        {
           "type":"click",
           "name":"Security hot spots",
           "key":"V1001_GOOD"
        }]
   },
       {
       "name":"Xiao An Wei Classroom",
       "sub_button":[
        {
           "type":"click",
           "name":"Learning Records",
           "key":"V1001_GOOD"
        },
        {
           "type":"click",
           "name":"Safe Learning",
           "key":"V1001_GOOD"
        },
        {
           "type":"click",
           "name":"Essential Security",
           "key":"V1001_HELLO_WORLD"
        },
        {
           "type":"click",
           "name":"Team Safety",
           "key":"V1001_GOOD"
        }]
       },
       
      {
       "name":"Test Assessment",
       "sub_button":[
       {
           "type":"click",
           "name":"Contact Xiao An",
           "key":"V1001_GOOD"
        },
        {
           "type":"click",
           "name":"Voting Activities",
           "key":"V1001_GOOD"
        },
        {
           "type":"click",
           "name":"Results Query",
           "key":"V1001_GOOD"
        },
        {
           "type":"click",
           "name":"Examination Evaluation",
           "key":"V1001_HELLO_WORLD"
        },
        {
           "type":"click",
           "name":"User Login",
           "key":"V1001_GOOD"
        }]
   }
   
   ]

}';

echo createMenu($data);
?>