This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.
Places the terminal in raw mode. Raw mode is similar to cbreak mode, in that characters typed are immediately passed through to the user program. The difference is that in raw mode, the interrupt, quit, suspend and flow control characters are all passed through uninterpreted, instead of generating a signal.
TRUE if any error occurred, otherwise
The method does not take any parameters