PHP cURL convert to GuzzleHttp - php

Question

Please, how to convert the following code to async GuzzleHttp?
In this way, php is waiting for the return of each query.
while ($p = pg_fetch_array($var)) {
$url = "https://url";
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
$headers = array("Content-Type: application/json");
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
$data = '{"s1":"s1","number":"'.$p['number'].'"}';
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
$resp = curl_exec($curl);
curl_close($curl);
var_dump($resp);
}

Answer 1

Here's a working example using native curl_multi_*() functions. Specifically:
curl_multi_init()
curl_multi_add_handle()
curl_multi_exec()
curl_multi_getcontent()
curl_multi_remove_handle()
curl_multi_close()
<?php
$urls = ['https://example.com/', 'https://google.com'];
$handles = [];
foreach ($urls as $url) {
$handle = curl_init();
curl_setopt($handle, CURLOPT_URL, $url);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
$handles[] = $handle;
}
$multiHandle = curl_multi_init();
foreach ($handles as $handle) {
curl_multi_add_handle($multiHandle, $handle);
}
for(;;){
curl_multi_exec($multiHandle, $stillRunning);
if($stillRunning > 0){
// some handles are still downloading, sleep-wait for data to arrive
curl_multi_select($multiHandle);
}else{
// all downloads completed
break;
}
}
foreach ($handles as $handle) {
$result = curl_multi_getcontent($handle);
var_dump($result);
curl_multi_remove_handle($multiHandle, $handle);
}
curl_multi_close($multiHandle);

Answer 2

Now, how convert the code cUrl to GuzzleHttp?