(PECL ssh2 >= 0.9.0)
ssh2_poll — Poll the channels/listeners/streams for events
&$desc, int $timeout = 30): intPolls the channels/listeners/streams for events, and returns the number of descriptors which returned non-zero revents.
本函数还未编写文档，仅有参数列表。
desc
An indexed array of subarrays with the keys
'resource' and 'events'.
The value of the resource is a (channel) stream or an SSH2 Listener resource.
The value of the event are SSH2_POLL* flags bitwise ORed together.
Each subarray will be populated with an 'revents' element on return,
whose values are SSH2_POLL* flags bitwise ORed together of the events that occurred.
timeoutThe timeout in seconds.
Returns the number of descriptors which returned non-zero revents.