How to solve the problem that php curl has no return value

php curl has no return value solution: 1. Open the corresponding PHP code file; 2. Solve it through the "curl_setopt($ch,CURLOPT_URL,$get_token_url);curl_setopt();..." code Can.

The operating environment of this article: Windows 7 system, PHP version 7.1, Dell G3 computer.

How to solve the problem that php curl has no return value?

php uses curl to access https and returns no results

Recently I am doing a WeChat automatic After logging in and initiating verification, the curl function returns empty when the page is called back to obtain the openid.

$appid = "appid appid "; 
$secret = "secret "; 
$code = $_GET["code"]; 
$get_token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$secret.'&code='.$code.'&grant_type=authorization_code';
//header("location:$get_token_url");
echo $get_token_url."<BR>";
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$get_token_url); 
curl_setopt($ch,CURLOPT_HEADER,0); 
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1 ); 
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,10); 
$res = curl_exec($ch); 
echo "echo:".json_encode($res)."<br>";     //显示false
echo curl_multi_getcontent($ch)."<br>";   //空
curl_close($ch);                     
$json_obj = json_decode($res,true); 
//根据openid和access_token查询用户信息 
$access_token = $json_obj[&#39;access_token&#39;]; 
$openid = $json_obj[&#39;openid&#39;]; 
var_dump($res);                                                     //显示obj(false)
echo $openid;

As a result, curl has no return value. Finally, Baidu found an article http://yanda.net.cn/articles/453. The

mentioned in the article was changed to the following Problem Solving

$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$get_token_url);
curl_setopt($ch,CURLOPT_HEADER,0); 
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); //不验证证书
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); //不验证证书
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1 ); 
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,10); 
$res = curl_exec($ch); 
var_dump($res);  //有返回值

Recommended study: "PHP Video Tutorial"

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