Set blocking/non-blocking mode on a stream
stream_set_blocking ( resource $stream , bool $mode ) : bool
If mode is FALSE, the given stream will be switched to non-blocking mode, and if TRUE, 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.
Returns TRUE on success or FALSE on failure.
stream mode | false
stream mode | true