int curl_multi_select(resource $mh[, float $timeout = 1.0])
Blocks until there is activity on any of the curl_multi connections.
On success, returns the number of descriptors contained in the descriptor sets. This may be 0 if there was no activity on any of the descriptors. On failure, this function will return -1 on a select failure (from the underlying select system call).
- resource $mh: A cURL multi handle returned by curl_multi_init().
- float $timeout [ = 1.0]: Time, in seconds, to wait for a response.