Non-blocking on STDIN in PHP CLI

Question

Is there anyway to read from STDIN with PHP that is non blocking:

I tried this:

stream_set_blocking(STDIN, false);
echo fread(STDIN, 1);         


        

Answer 1

system('stty cbreak');
while(true){
    if($char = fread(STDIN, 1)) {
        echo chr(8) . mb_strtoupper($char);
    }
}