( resource stream, int mode )
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.
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
This function was previously called as
set_socket_blocking() and later
socket_set_blocking() but this usage is deprecated.
Prior to PHP 4.3, this function only worked on socket based streams.
Since PHP 4.3, this function works for any stream that supports
non-blocking mode (currently, regular files and socket streams).