(PHP 4 >= 4.3.0, PHP 5)
stream_set_blocking — Set blocking/non-blocking mode on a stream
Sets blocking or non-blocking mode on a stream.
This function works for any stream that supports non-blocking mode (currently, regular files and socket streams).
If mode is 0, the given stream will be switched to non-blocking mode, and if 1, it will be switched to blocking mode. This affects calls like fgets() and fread() that read from the stream. In non-blocking mode an fgets() call will always return right away while in blocking mode it will wait for data to become available on the stream.
成功时返回 TRUE， 或者在失败时返回 FALSE.
|4.3.0||Prior to PHP 4.3.0, this function only worked on socket based streams.|