Solution to curl returning false in php

#This article introduces the solutions to the problems I encountered when using curl. Hope it helps everyone. First, let’s look at an encapsulated curl function

function request_post($url = '', $param = '') {
   if (empty($url) || empty($param)) {
       return false;
   }
   $postUrl = $url;
   $curlPost = $param;
   $curl = curl_init();//初始化curl
   curl_setopt($curl, CURLOPT_URL,$postUrl);//抓取指定网页
   curl_setopt($curl, CURLOPT_HEADER, 0);//设置header
   curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);//要求结果为字符串且输出到屏幕上
   curl_setopt($curl, CURLOPT_POST, 1);//post提交方式
   curl_setopt($curl, CURLOPT_POSTFIELDS, $curlPost);//提交的参数
   $data = curl_exec($curl);//运行curl
   curl_close($curl);
   return $data;
}

When called, the return result is bool(false)

The error we get through curl_error($curl) in front of the curl_exec function is also string(0) " " Empty string.

Finally, I found that the interface address of the api I called was of the SSL protocol, and then just added the following two.

curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);

If the address requested by curl contains spaces, it will also return false. Pay special attention to this as well.

I have encountered a return false print curl_error($curl) before and got the following error

string(39) "Problem (2) in the Chunked-Encoded data" bool(false)

The solution to this error is to set the HTTP protocol version used by curl, which is to add the following Sentence

//CURL_HTTP_VERSION_1_0 (强制使用 HTTP/1.0)
//CURL_HTTP_VERSION_1_1 (强制使用 HTTP/1.1)。
curl_setopt($curlp, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);

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