How to obtain results for shell-phpcurl asynchronous requests

{Code ...}

Function request ($ url, $ payload) {$ cmd = "curl-x post-H 'content-Type: application/json'"; $ cmd. = "-d '". $ payload. "'". "'". $ url. "'"; if (! $ This-> debug () {$ cmd. = ">/dev/null 2> & 1 &" ;}// send an asynchronous request exec ($ cmd, $ output, $ exit ); return $ exit = 0;}?>

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Function request ($ url, $ payload) {$ cmd = "curl-x post-H 'content-Type: application/json'"; $ cmd. = "-d '". $ payload. "'". "'". $ url. "'"; if (! $ This-> debug () {$ cmd. = ">/dev/null 2> & 1 &" ;}// send an asynchronous request exec ($ cmd, $ output, $ exit ); return $ exit = 0;}?>

$a=exec($cmd, $output, $exit);

Why can't you use the php curl function?

Curl should not work, but callback can be called at the request address.
You can use a swoole network framework.

$ Ch = curl_init ();
Curl_setopt ($ ch, CURLOPT_URL, $ url );
Curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1 );
Curl_setopt ($ ch, CURLOPT_TIMEOUT, 10 );
$ Response = curl_exec ($ ch );

Swoole can be implemented asynchronously. you can do this synchronously.