stream_select() not working on regular files?

Hi, I'm trying to implement something similar to "tail -f" in php but I'm running into a problem. The issue occurs when I've reached the end of the file. From here I basically have to loop until new lines get appended to the file but I would like to respond immediately when then happens. There are three options that I can see: 1. Busy-loop pro: I can process new lines immediately contra: Excessivley CPU intensive => not a real option 2. add a sleep(1) to the loop pro: No longer kills the CPU contra: I might get a 1 second delay until I can process new lines 3. stream_select(array($fh),null,null,1) pro: sleeps for one second but returns earlier if new data arrives contra: doesn't seem to work in files? Method 3 is the preferable one but doesn't seem to work: $fh = fopen("testfile","r"); $r = array($fh); while( ($n = stream_select($r,$w=null,$e=null,1)) == 1 ) {

    echo fgets($fh);

} This program will loop forever because stream_select() will always return 1 even at the end of the file. Is there any other way to accomplish this? Regards, Dennis