NOTE: current implementation of `curl_multi_select` doesn't block and doesn't respect timeout parameter (maybe will be fixed later, in this case just remove the usleep call)
here, i would like to post my working/tested example of proper usage of this function:
```
$running = 1;
while ($running)
{
# execute request
if ($a = curl_multi_exec($this->murl, $running)) {
throw BotError::text("curl_multi_exec[$a]: ".curl_multi_strerror($a));
}
# check finished
if (!$running) {
break;
}
# wait for activity
while (!$a)
{
if (($a = curl_multi_select($this->murl, $timeout)) < 0)
{
throw BotError::text(
($a = curl_multi_errno($this->murl))
? "curl_multi_select[$a]: ".curl_multi_strerror($a)
: 'system select failed'
);
}
usleep($timeout * 1000000);# should be <=1
}
}
```
